16364528
Descripción
Test por Мумия Фумия, actualizado hace más de 1 año
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Creado por Мумия Фумия
hace más de 5 años
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Pregunta 1
Pregunta
1. The PEAR DB functions can be accessed using DB::<function_name>.
Respuesta
- True
- False
Pregunta 2
Pregunta
2. The string argument of the function for connecting to a database is of the format <DBMS software>://<user account>:<password>@<database server>
Respuesta
- True
- False
Pregunta 3
Pregunta
3. The PEAR DB functon for connecting to a database is called DB::linkto database('string').
Respuesta
- True
- False
Pregunta 4
Pregunta
4. The DBMS software in <DBMS software>://<user account>:<password>@<database server> stands for the particular DBMS software package being connected to: for example mysqli for versions of MySQL starting with version 4.1.2
Respuesta
- True
- False
Pregunta 5
Pregunta
5. The PEAR DB function DB::is Error can be used to determine whether any database access operation was successful or not.
Respuesta
- True
- False
Pregunta 6
Pregunta
6. In PHP, an _____ array provides pairs of key=>value elements; the value of an element is referenced through its key and all key values in a particular array must be unique.
Respuesta
-
a) Numeric
-
b) Value
-
c) String
-
d) Associative
Pregunta 7
Pregunta
7. Multi-line PHP comments start with // and end with #.
Respuesta
- True
- False
Pregunta 8
Pregunta
8. PHP written in C and usually comes installed with Unix: for other operating systems, the PHP interpreter can be downloaded from http://www.php.net
Respuesta
- True
- False
Pregunta 9
Pregunta
9. The PHP start tag is <?php and end the tag is ?>.
Respuesta
- True
- False
Pregunta 10
Pregunta
10. Web pages, where part of the information is extracted from databases or other data source, are called dynamic Web pages
Respuesta
- True
- False
Pregunta 11
Pregunta
11. In PHP, a ____ array associates a numeric index with each element in the array
Respuesta
-
a) Numeric
-
b) Associated
-
c) Variable
-
d) String
Pregunta 12
Pregunta
12. PHP variable names start with a $ sign and can include characters, numbers, and the underscore character
Respuesta
- True
- False
Pregunta 13
Pregunta
13. Interpolating variables occurs only within single-quoted strings.
Respuesta
- True
- False
Pregunta 14
Pregunta
14. PHP programs are executed on the client.
Respuesta
- True
- False
Pregunta 15
Pregunta
15. The auto-global predefined PHP variable $_POST is an array that holds all the values entered through form parameters.
Respuesta
- True
- False
Pregunta 16
Pregunta
16. The JDBC _____ libraries are called java.sql.*
Respuesta
-
a) Method
-
b) Function
-
c) Class
Pregunta 17
Pregunta
17. JDBC does not distinguish between queries that return single tuples and those that return multiple tuples.
Respuesta
- True
- False
Pregunta 18
Pregunta
19. The use of function calls is a more dynamic approach for database programming than embedded SQL.
Respuesta
- True
- False
Pregunta 19
Pregunta
20. A _____ object is similar to a cursor in embedded SQL and an iterator in SQLJ.
Respuesta
-
a) Procedure
-
b) Function call
-
c) Result Set
Pregunta 20
Pregunta
21. _____ is the part of the SQL standard that specifies how to write persistent stored modules.
Respuesta
-
a) SQL/PSM
-
b) XML
-
c) SQLJ
-
d) ResultSet
Pregunta 21
Pregunta
22. Database stored procedures (aka persistent stored modules) are stored and executed by the DBMS at the database server.
Respuesta
-
True
-
False
Pregunta 22
Pregunta
23. Discuss advantages and diadvantages to the library of function calls approach
Respuesta
-
a) Disadvantage are the loss of flexibility in changing the query at runtime and that all changes to queries must be recompiled.
-
b) The main advantage is flexibility in generating queries at runtime. Also, the library of function calls approach is able to call multiple data program.
-
c) The main advantage is flexibility in generating queries at compile time. Also, the library of function calls approach is able to call multiple single program.
-
d) Disadvantages are more complex programming, inability to do checking at compile time, and concerns about SQL runtime errors.
-
e) The main advantage is the query text is part of source code and can be checked for syntax errors and validated against the data. The program is quite readable.
Pregunta 23
Pregunta
24. It is necessary to have a binding between the data types of the programming language and the attribute data types in the data model
Respuesta
- True
- False
Pregunta 24
Pregunta
25. In SQLJ, embedded SQL commands are preceded by #sql.
Respuesta
- True
- False
Pregunta 25
Pregunta
27. One advantage of using an SQLJ translator is that it is not necessary to install drivers such as a JDBC driver.
Respuesta
- True
- False
Pregunta 26
Pregunta
28. Describe the three main approaches for database programming.
Respuesta
-
a) Using a library of database functions. This approach provides what is known as an application programming interface (API) for accessing a database from applications programs.
-
b) Using a library of database methods. This approach provides what is known as an application programming interface (API) for accessing a database from applications programs
-
c) Embedded SQL. Embeding database commands in a general-purpose programming language. A preprocessor extracts the embedded SQL from the source code and replaces it with function calls to DBMS-generated code.
-
d) Embedded SQL. Embeding database commands in a specific-purpose programming language. A preprocessor can not extract code, but function calls to be extracted to DBMS-generated code.
-
e) Designing a new database programming language.
-
f) Embedded SQL. Embeding database commands in a specific-purpose programming language. A preprocessor extracts the embedded SQL from the source code and replaces it with function calls to DBMS-generating code
Pregunta 27
Pregunta
29. In XML _____ defines the set of commands (names) that can be used
Respuesta
-
a) Namespace
-
b) Valid
-
c) Document
-
d) Invalid
Pregunta 28
Pregunta
30. In XML schema, the tag _____ is used tospecify primary keys.
Respuesta
-
a) xs:element
-
b) xsd:key
-
c) psd:schema
-
d) xs:sequence
Pregunta 29
Pregunta
31. A * following an element name means the element can be repeated zero or one times (an optional, single-valued, nonrepeating elements)
Respuesta
- True
- False
Pregunta 30
Pregunta
32. If an XML document is well-formed and follows a particular schema, it is _____
Respuesta
-
a) Namespace
-
b) Keys
-
c) Invalid
-
d) Valid
Pregunta 31
Pregunta
33. The XML schema, it is possible to specify constraints that correspond to unique and primary key constraints ina relational database, as well as foreign keys constraints
Respuesta
- True
- False
Pregunta 32
Pregunta
34. An element that does not have *, +, or ? following the element name means the element must appear exactly once in the document (a required, single-valued, nonrepeating element).
Respuesta
- True
- False
Pregunta 33
Pregunta
35. A ? following an element name means that element can be repeated zero or more times in the document (an optional, mult-valued, repeating element).
Respuesta
- True
- False
Pregunta 34
Pregunta
36. The basic object in XML is the XML document, which is structured using types and iterators.
Respuesta
- True
- False
Pregunta 35
Pregunta
37. How does a well-formed XML document look like?
Respuesta
-
a) It is syntactically correct: a non-single root element with every element including a matching pair of start/end tags within the start-end of the parent element
-
b) It must finish with an XML declaration to indicate the version of XML.
-
c) It is syntactically correct: a single root element with every element including a matching pair of start/end tags within the start-end tags of the parent element
-
d) It is syntactically correct: a single root element with every element except a matching pair of start/end tags within the start-end tags of the parent elements
-
e) It must start with an XML declaration to indicate the version of XML
Pregunta 36
Pregunta
38. Struct type constructors include the set (T), list (T), bag(T), array(T), and dictionary (K,T) type constructors.
Respuesta
- True
- False
Pregunta 37
Pregunta
39. Three major differences between the relational and object database design.
Respuesta
-
a) In ODB design a binary relationship can be declared in one direction or both. If attributes are included in both directions, there is a potential problem with redundancy.
-
b) In ODB design a binary relationship can be declared in one direction or both. If attributes are included in both directions, there is no any problem
-
c) In an ODB, operations must be defined early since they are part of the classes specifications. In RDBs, operations may not be defined until implementation
-
d) In RDB inheritance is built into the model; ODBs do not have built-in constructs for inheritance.
-
e) In an RDB, operations must be defined early since they are part of the class specifications. In an ODB, operations may not be defined until implementation
-
f) In ODB inheritance is built into the model; RDBs do not have built-in constructs for inheritance.
Pregunta 38
Pregunta
40. The typical mechanisms for making an object an object persistent are naming and reachability.
Respuesta
- True
- False
Pregunta 39
Pregunta
41. The main property required of an OID is that it be immutable (should not change).
Respuesta
- True
- False
Pregunta 40
Pregunta
42. _____ inheritance occurs when a subtype inherits only some of the functions of a supertype.
Respuesta
-
a) Generalisation
-
b) Complete encapsulation
-
c) Conditional
-
d) Selective
Pregunta 41
Pregunta
43. In operator overloading (or polymorphism), an operation name may refer to several distinct implementations, depending on the type of object it is applied to.
Respuesta
- True
- False
Pregunta 42
Pregunta
44. In ______ all operations that can be applied to an object must be predefined.
Respuesta
-
a) Half encapsulation
-
b) Complete encapsulation
-
c) Object identifier
-
d) Feedback loop
Pregunta 43
Pregunta
45. The implementation of an operation is called its signature.
Respuesta
- True
- False
Pregunta 44
Pregunta
46. A subtype is used when a new type is needed that is similar but not identical to an already defined type.
Respuesta
- True
- False
Pregunta 45
Pregunta
47. The dictionary constructor creates a collection of two tupes (K,V) where the value of a key K can be used to retrieve the can be used to retrieve the corresponding value V.
Respuesta
- True
- False
Pregunta 46
Pregunta
48. An ODMS provides a unique identity to each independent object in the database via a unique, system-generated ____.
Respuesta
-
a) Selective
-
b) Complete encaplsulation
-
c) Object identifier
Pregunta 47
Pregunta
49. An object typically has three components: state, timing, and behavior
Respuesta
- True
- False
Pregunta 48
Pregunta
50. The 80-20 rule suggests that 80% of the workload is presented by 20% of the most frequently used transactions, which govem the physical database design.
Respuesta
- True
- False
Pregunta 49
Pregunta
51. The phases (or activities) of the life cycle are not strictly in sequence; ______ are common among and within the phases of the life cycle.
Respuesta
-
a) One-shot
-
b) Requirements collection
-
c) Feedback loop
-
d) View integration
Pregunta 50
Pregunta
52. In the _____ approach to schema design, a scheme is designed for each user group or application based phase, these schemas are merged into a global conecptual schema.
Respuesta
-
a) Requirements analysis
-
b) Feedback loops
-
c) Feasibility analysis
-
d) One-shot
-
e) View integration
Pregunta 51
Pregunta
53. A large database typically has large transaction volumes and rates, is used in service sector industries, and runs 24/7
Respuesta
- True
- False
Pregunta 52
Pregunta
54. Many organizations use data dictionary systems (information repositories) to manage meta-data, i.e., data that describes the database structure, constraints, applications, authorizations, users, and so forth.
Respuesta
- True
- False
Pregunta 53
Pregunta
55. What are the three goals of database design?
Respuesta
-
a) Satisfy the information content requirements of the generalised users and applications.
-
b) Support result
-
c) Support processing requirements and any performance objectives.
-
d) Provide a natural and easy-to-understand structuring of the information.
-
e) Satisfy the information content requirements ofthe specified users and applications.
-
f) Provide a comlicated structuring of the information.
Pregunta 54
Pregunta
56. _______ involves interacting with potential users and user groups to identify their particular problems and needs.
Respuesta
-
a) view-integration
-
b) requirements collection and analysis
-
c) feasibility analysis
-
d) one-shot
-
e) feedback loop
Pregunta 55
Pregunta
57. A transaction processing system can be characterized as one with several dozen gigabytes of data and a schema with more than 30 or 40 distinct entity types
Respuesta
- True
- False
Pregunta 56
Pregunta
58. Identify the three criteria to guide the choice of physical database design options
Respuesta
-
a) Space utisilation
-
b) Availability of vendor services
-
c) Transaction throughput
-
d) Response time
-
e) Familiarity of personnel with the system
Pregunta 57
Pregunta
59. Identify the three factors to consider in choosing one DBMS over another
Respuesta
-
a) Space utisilation
-
b) Organization-wide adoption of a certain philosophy (data model, vendor, methodology, tools)
-
c) Availability of vendor services
-
d) Transaction throughput
-
e) Response time
-
f) Familiarity of personnel with the system
Pregunta 58
Pregunta
60. _____ is concerned with analyzing potential application areas, identifying the economics of information gathering and dissemination, performing preiliminary cost-benefit studies, determining the complexity of data and processes, and setting up priorities among applications.
Respuesta
-
a) Feasibility analysis
-
b) Requirements collection and analysis
-
c) View integration
-
d) One-shot
-
e) Feedback loops
Pregunta 59
Pregunta
61. The initial requirements can be expected to be formal, complete, consistent, and correct.
Respuesta
- True
- False
Pregunta 60
Pregunta
62. In the ______ schema design approach, the requirements from the different stakeholders are merged into a single set of requirements before the schema design begins.
Respuesta
-
a) Requirements collection
-
b) Feedback loop
-
c) Centralized (or one-shot)
-
d) Requirements analysis
Pregunta 61
Pregunta
63. What two things does minimizing redundancy imply?
Respuesta
-
a) Reducing the need for multiple updates to maintain consistency across multiple copies of the same information.
-
b) Reducing the redundant information in tuples.
-
c) Making sure the semantics of the attributes is clear in the schema
-
d) Minimizing redundant storage of the same information
-
e) Disallowing the possibility of generating spurious tuples
Pregunta 62
Pregunta
64. Third normal form (3NF): R is 2NF and all non-prime attributes are transively dependent on the primary key.
Respuesta
- True
- False
Pregunta 63
Pregunta
65. First normal from (1NF): the domain of an attribute must include only atomic (simple, indivisible, scalar) values and the value of any attribute ina tuple must be a single value from the domain of that attribute.
Respuesta
- True
- False
Pregunta 64
Pregunta
66. A functional dependency is a property of the relation schema R not of a particular legal relation state r or R, therefor it must understands the semantics of the attributes of R.
Respuesta
- True
- False
Pregunta 65
Pregunta
67. Second normal form (2NF): R is 1NF and every non-prime attribute A in R is fully functionally dependent on the primary key of R
Respuesta
- True
- False
Pregunta 66
Pregunta
68. What are four informal guidelines that may be used to measure the quality of a relation schema design?
Respuesta
-
a) Reducing the need for multiple updates to maintain consistency across multiple copies of the same information.
-
b) Disallowing the possibility of generating spurious tuples.
-
c) Reducing the redundant information in tuples
-
d) Reducing the NULL values in tuples
-
e) Making sure the semantics of the attributes is clear in the schema
-
f) Minimizing redundant storage of the same information
Pregunta 67
Pregunta
69. Normalization of data can be considered a process of analyzing the given relation schemas based on their functional dependencies and primary keys to achieve closure on the domain space
Respuesta
- True
- False
Pregunta 68
Pregunta
71. When mapping a binary M:N relationship type R, create a new relation S to represent R, including as foreign key attributes in S the primary keys of the relations that are the perticipating entity types (their combination in S is the composite primary key of S).
Respuesta
- True
- False
Pregunta 69
Pregunta
The symbol σ (sigma) is used to denote the SELECT operator in the relational algebra
Respuesta
- True
- False
Pregunta 70
Pregunta
A EQUIJOIN uses any of the comparison operators =, <, ≤, >, ≥, or ≠.
Respuesta
- True
- False
Pregunta 71
Pregunta
The symbol π (pi) is used to denote the PROJECT operation in the relational algebra.
Respuesta
- True
- False
Pregunta 72
Pregunta
78. A THETA JOIN uses the comparison operator =
Respuesta
- True
- False
Pregunta 73
Pregunta
80. SQL is both a data definition language (DDL) and a data manipulation language (DML).
Respuesta
- True
- False
Pregunta 74
Pregunta
81. A key uniquely identifies a tuple in a relation.
Respuesta
- True
- False
Pregunta 75
Pregunta
82. When the DELETE operation violates a contraint, the deletion must be rejected.
Respuesta
- True
- False
Pregunta 76
Pregunta
83. Semantic integrity constarint may be enforced using mechanisms called triggers and assertions.
Respuesta
- True
- False
Pregunta 77
Pregunta
84. If a multi-table query refers to two or more attributes with the same name, we must qualify the attribute name with the table name, e.g., TABLE.Attribute, to prevent ambiguity.
Respuesta
- True
- False
Pregunta 78
Pregunta
85. A relation schema may only have one key.
Respuesta
- True
- False
Pregunta 79
Pregunta
86. Tuples in a relation are ordered.
Respuesta
- True
- False
Pregunta 80
Pregunta
88. The DELETE operation can violate referential integrity.
Respuesta
- True
- False
Pregunta 81
Pregunta
89. The INSERT operation can violate domain constraints, key constraints, entity integrity, or referential integrity.
Respuesta
- True
- False
Pregunta 82
Pregunta
90. The theortical basis of the relation data model is set theory and first-order predicate logic.
Respuesta
- True
- False
Pregunta 83
Pregunta
92. Attributes that represent the same real-world concept must have identical names in different relations.
Respuesta
- True
- False
Pregunta 84
Pregunta
93. When the INSERT operation violates a constraint, the default option is to reject the insertion.
Respuesta
- True
- False
Pregunta 85
Pregunta
94. Attributes must have unique domains.
Respuesta
- True
- False
Pregunta 86
Pregunta
95. NULL values may mean value unknown, value exits but is not available, attribute does not apply to this tuple (value undefined).
Respuesta
- True
- False
Pregunta 87
Pregunta
96. All tuples in a relation must be distinct.
Respuesta
- True
- False
Pregunta 88
Pregunta
102. The $d->query function takes an SQL command as its string argument and sends it to the database server for execution.
Respuesta
- True
- False
Pregunta 89
Pregunta
103. The _____ is a collection of several libraries of functions for enhancing PHP.
Respuesta
-
a) DBMS
-
b) PHP Extension and Application Repository (PEAR)
-
c) MYSQL
-
d) PHP SQL
Pregunta 90
Pregunta
104. The _____ variable is similar to cursor and iterator variables.
Respuesta
-
a) $d->query
-
b) post
-
c) $r
Pregunta 91
Pregunta
105. The abend function can be used to terminate a PHP program if there is an error.
Respuesta
- True
- False
Pregunta 92
Pregunta
106. The PHP function $d->nextID creates a sequence of unique values for a particular table.
Respuesta
- True
- False
Pregunta 93
Pregunta
115. The ___________ R S keeps tuple in the first {left} relation R; if no matching tuple found in S, then the attribute of S in the join are filled with NULL values
Respuesta
-
o LEFT OUTER JOIN
-
o RIGHT OUTER JOIN
-
o FULL OUTER JOIN
-
o LEFT INNER JOIN
Pregunta 94
Pregunta
116. If a relation schema has more than one key, each is called a _______ key.
Respuesta
-
o Candidate
-
o Primary
-
o Public
-
o Foreign
Pregunta 95
Pregunta
117. A ¬¬¬_________conflict arises when an attribute may have different domains in two schemas, e.g. pounds vs kilograms
Respuesta
-
o Domain
-
o Type
-
o Norming
-
o Constraints
Pregunta 96
Pregunta
119. Objects in an object-oriented programming language exist only during program execution, therefore they are called transient objects; an object-oriented database can extend the existence of objects so that they are stored permanently, therefore they are called
Respuesta
-
o persistent object
-
o instance variable
-
o attribute
-
o object structure
Pregunta 97
Pregunta
120. __________________ is the term used to refer to the problems that occur because of difference between the database model and the programming language model.
Respuesta
-
o Independence mismatch
-
o Denormalisation
-
o Redundancy
-
o Duplication
Pregunta 98
Pregunta
121. A __________________ is typically used to loop over the tuples in a query result
Respuesta
-
o Cursor {iterator variable}
-
o Shared variable
-
o Communication variables
-
o fetch
Pregunta 99
Pregunta
122. NULL values may mean value unknown, value exists but isn't available, and attribute does not apply to this tuple (value undefined)
Respuesta
-
True
-
False
Pregunta 100
Pregunta
123. A THETA JOIN uses any of the comparison operators =,<,>
Respuesta
- True
- False
Pregunta 101
Pregunta
124. For structured data, the schema information is mixed in with the data values, so it is sometimes referred to as self-describing data.
Respuesta
- True
- False
Pregunta 102
Pregunta
125. The main advantage of using a function call interface is that it makes it easier to access multiple databases within the same application program
Respuesta
- True
- False
Pregunta 103
Pregunta
126. In PHP, Interpolating variables may occur within double-quoted or single-quoted strings
Respuesta
- True
- False
Pregunta 104
Pregunta
127. In PHP, the $d->query function takes an SQL command as its string argument and sends it to the database server for execution.
Respuesta
- True
- False
Pregunta 105
Pregunta
128. The ________________ property ensures that either all the database operations in a transaction are executed or none are
Respuesta
-
o Atomicity
-
o Transaction
-
o Isolation
-
o Concurrency
Pregunta 106
Pregunta
129. ____________________occurs when the same data is stored multiple times
Respuesta
-
o Redundancy
-
o Normalisation
-
o Denormalization
-
o Persistent
Pregunta 107
Pregunta
130. Creating a database design that only stores each logical data item in only one place is the database is called______________________.
Respuesta
-
o Redundancy
-
o Normalization
-
o Denormalization
-
o Persistent
Pregunta 108
Pregunta
131. When a database design is in ____________, each value in a tuple is in atomic value.
Respuesta
-
o First normal form
-
o Second normal form
-
o Third normal form
-
o Forth normal form
Pregunta 109
Pregunta
132. An entity cannot exist in a database merely by being a member of a subclass, it must also be a member of the superclass
Respuesta
- True
- False
Pregunta 110
Pregunta
133. An entity that is a member of a subclass may inherit one, some, or all the attributes of the entity as a member of the superclass.
Respuesta
- True
- False
Pregunta 111
Pregunta
134. The ________________ property allows several users to update the same data in a controlled manner so that result of the updates is correct
Respuesta
-
o Atomicity
-
o Transaction
-
o Isolation
-
o Concurrency
Pregunta 112
Pregunta
The theoretical basis of the relational data model is set theory and first-order predicate logic
Respuesta
- True
- False
Pregunta 113
Pregunta
Semantic integrity constraints may be enforced using mechanisms called triggers and assertions.
Respuesta
- True
- False
Pregunta 114
Pregunta
When mapping a binary M:N relationship type R, create a new relation S to represent R, including as foreign key attributes in S the primary keys of the relations that are the participating entity types (their combination in S is the composite primary key of S).
Respuesta
- True
- False
Pregunta 115
Pregunta
$_SESSION − An associative array containing session variables available to the current script.
Respuesta
- True
- False
Pregunta 116
Pregunta
PHP makes use of mail() function to send an email. This function requires three mandatory arguments that specify the recipient's email address, the subject of the the message and the actual message additionally there are other two optional parameters.
Respuesta
- True
- False
Pregunta 117
Pregunta
The interpreter identifies variable names within double-quoted strings by their initial character $ and replaces them with the value in the variable. This is known as interpolating variables within strings. Interpolation does not occur in single-quoted strings
Respuesta
- True
- False
Pregunta 118
Pregunta
SQLJ was developed after JDBC, which is used for accessing SQL data- bases from Java using function calls
Respuesta
- True
- False
Pregunta 119
Pregunta
Most NoSQL databases support automatic __________, meaning that you get high availability and disaster recovery
Respuesta
-
<text>processing</text>
-
<text>scalability</text>
-
<text>replication</text>
-
<text>All of the mentioned</text>
Pregunta 120
Pregunta
The Web Services Architecture supports interaction between a service provider, service requestor, and service registry.
Respuesta
- True
- False
Pregunta 121
Pregunta
Multi-line PHP comments start with // and end with #.
Respuesta
- True
- False
Pregunta 122
Pregunta
Define types of abstractions by the relations as "A is <u>made of/composed of</u> B,C,D"
Respuesta
-
Classification
-
Aggregation
-
Generalization
-
Specialization
Pregunta 123
Pregunta
FETCH commands are issued in the program; each FETCH moves the cursor to the next row in the result of the query, making it the cur- rent row and copying its attribute values into the C (host language) program variables specified in the FETCH command by an INTO clause.</text>
Respuesta
- True
- False
Pregunta 124
Pregunta
Define types of abstractions by the relations as "B,C,D are special cases of A"
Respuesta
-
Classification
-
Aggregation
-
Generalization
-
Specialization
Pregunta 125
Pregunta
A JDBC driver is basically an implementation of the function calls specified in the JDBC application programming interface (API) for a particular vendor's RDBMS.
Respuesta
- True
- False
Pregunta 126
Pregunta
In PHP, a numeric array associates a numeric index with each element in the array.
Respuesta
- True
- False
Pregunta 127
Pregunta
Before being able to process JDBC function calls with Java, it is necessary to import the JDBC class libraries, which are called java.sql.*.
Respuesta
- True
- False
Pregunta 128
Pregunta
How can you change "Hansen" into "Nilsen" in the "LastName" column in the Persons table?
Respuesta
-
• UPDATE Persons SET LastName='Hansen' WHERE LastName='Nilsen'
-
• UPDATE Persons SET LastName='Nilsen' WHERE LastName='Hansen'
-
• MODIFY Persons SET LastName='Hansen' WHERE LastName='Nilsen'
-
• UPDATE FROM Persons SET LastName='Nilsen' WHERE LastName='Hansen'
Pregunta 129
Pregunta
Publisher table contains id and name columns. Id is auto incremented and name is of varchar(40) type. Which of the following queries will execute NOT correctly?
Respuesta
-
INSERT INTO Publisher (name) values ('O'Reilly');
-
INSERT INTO Publisher (name) values ('O Reilly');
-
INSERT INTO Publisher (name) values ('OReilly');
-
INSERT INTO Publisher (name) values ('O-Reilly');
Pregunta 130
Pregunta
What is the correct order of clauses for a proper SQL query?
Respuesta
-
SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY
-
SELECT, FROM, WHERE, GROUP BY, ORDER BY, HAVING
-
SELECT, FROM, GROUP BY, WHERE, HAVING, ORDER BY
-
SELECT, FROM, WHERE, HAVING, GROUP BY, ORDER BY
Pregunta 131
Pregunta
Which clause indicates the table(s) from which data is to be retrieved?
Respuesta
-
FROM
-
SELECT
-
WHERE
-
GROUP BY
-
HAVING
Pregunta 132
Pregunta
161. Which clause is executed first in a SQL query?
Respuesta
-
WHERE
-
SELECT
-
FROM
-
ON
Pregunta 133
Pregunta
162. Which of the following DROP statements is INCORRECT?
Respuesta
-
• DROP DATABASE
-
• DROP ROW
-
• DROP INDEX
-
• DROP TABLE
Pregunta 134
Pregunta
163. Which of the following is NOT a language element of SQL?
Respuesta
-
Expression
-
Data mining
-
Query
-
Statement
-
Clause
Pregunta 135
Pregunta
Which operator is used to search for a specified pattern in a column?
Respuesta
-
WHERE
-
LIKE
-
ALIASE
-
PATTERN
Pregunta 136
Pregunta
165. Which operator is used to select values within a range?
Respuesta
-
RANGE
-
AND
-
BETWEEN
-
OR
Pregunta 137
Pregunta
With SQL, how can you delete the records where the "Address" is "Almaty" in the Student Table?
Respuesta
-
• DROP ROW Student ='Almaty' FROM Address
-
• DELETE FROM Student ROW Address ='Almaty'
-
• DROP ROW Address ='Almaty' FROM Student
-
• DELETE ROW Address ='Almaty' FROM Student
Pregunta 138
Pregunta
166. Which term is used to describe data organized in rows and columns?
Respuesta
-
Query
-
Program
-
Index
-
Table
Pregunta 139
Pregunta
With SQL, how can you return all the records from a table named "Persons" sorted descending by "FirstName"?
Respuesta
-
• SELECT * FROM Persons GROUP BY FirstName DESC
-
• SELECT * FROM Persons WHERE FirstName DESC
-
• SELECT * FROM Persons ORDER BY FirstName
-
• SELECT * FROM Persons ORDER BY FirstName DESC
Pregunta 140
Pregunta
169. With SQL, how can you return the number of records in the "Employee" table?
Respuesta
-
• SELECT COUNT(*) FROM Employee
-
• SELECT * FROM Employee GROUP BY
-
• SELECT NUM(*) FROM Employee
-
• RETURN COUNT(*) FROM Employee
Pregunta 141
Pregunta
170. With SQL, how do you select all the records from a table named "Persons" where the value of the column "FirstName" starts with an "a"?
Respuesta
-
• SELECT * FROM Persons WHERE FirstName LIKE 'a%';
-
• SELECT * FROM Persons WHERE FirstName LIKE '%a%';
-
• SELECT All FROM Persons WHERE FirstName LIKE='a';
-
• SELECT * FROM Persons WHERE FirstName LIKE 'a*';
Pregunta 142
Pregunta
171. With SQL, how do you select all the records from a table named "Persons" where the "FirstName" is "Alma" and the "LastName" is "Alimova"?
Respuesta
-
• SELECT * FROM Persons WHERE FirstName=' Alma ' AND LastName=' Alimova'
-
• SELECT * FROM Persons WHERE FirstName=' Alma ' OR LastName=' Alimova'
-
• SELECT FROM Persons WHERE FirstName=' Alma ' AND LastName=' Alimova'
-
• SELECT * FROM Persons HAVING FirstName=' Alma ' AND LastName=' Alimova'
Pregunta 143
Pregunta
Which of the following is not a NoSQL database ?
Respuesta
-
SQL Server
-
MongoDB
-
Cassandra
-
None of the mentioned
Pregunta 144
Pregunta
Which of the following is a NoSQL Database Type ?
Respuesta
-
SQL
-
Document databases
-
JSON
-
All of the mentioned
Pregunta 145
Pregunta
Which of the following is a wide-column store ?
Respuesta
-
Cassandra
-
Riak
-
MongoDB
-
Redis
Pregunta 146
Pregunta
An ODMS provides a unique identity to each independent object stored in the database via a unique, system-generated ________________
Respuesta
-
<text>object identifier (OID)</text>
-
<text>literals</text>
-
<text>indirect pointer</text>
-
<text>constructor</text>
Pregunta 147
Pregunta
Define types of abstractions by the relations as "A is a <u>member of</u> class B
Respuesta
-
<text>Classification</text>
-
<text>Aggregation</text>
-
<text>Generalization</text>
-
<text>Specialization</text>
Pregunta 148
Pregunta
Define types of abstractions by the relations as "B <u>is-an</u> A, C <u>is-an</u> A, D <u>is-an</u> A"
Respuesta
-
Classification
-
Aggregation
-
Generalization
-
Specialization
Pregunta 149
Pregunta
How will you close a MySql database using PHP?
Respuesta
-
mysql_destroy
-
mysql_exit
-
mysql_end
-
mysql_close
Pregunta 150
Pregunta
How will you concatenate two strings?
Respuesta
-
Using . operator
-
Using + operator
-
Using add() function
-
Using append() function
Pregunta 151
Pregunta
How will you connect a MySql database using PHP?
Respuesta
-
mysql_connection
-
mysql_query
-
mysql_fetch_array
-
mysql_connect
Pregunta 152
Pregunta
How will you destroy a session in PHP?
Respuesta
-
session_destroy()
-
destroy_session()
-
$_SESSION['destroy']
-
$_SESSION['']
Pregunta 153
Pregunta
How will you start a session in PHP?
Respuesta
-
<text>session_start()</text>
-
<text>start_session()</text>
-
<text>$_SESSION['start']</text>
-
<text>$_SESSION['']</text>
Pregunta 154
Pregunta
How will you unset a single session variable?
Respuesta
-
<text><![CDATA[<?phpunset($_SESSION['counter']);?>]]></text>
-
<text><![CDATA[<?phpisset($_SESSION['counter']); ?>]]></text>
-
<text>$_SESSION['unset']</text>
-
<text>$_SESSION['']</text>
Pregunta 155
Pregunta
Identify factors to consider in choosing one DBMS over another. I. Organization-wide adoption of a certain philosophy (data model, vendor, methodology, tools).
I. Familiarity of personnel with the system. III. Availability of vendor services.
Respuesta
-
• <text>I, II</text>
-
• <text>I, II, III</text>
-
• <text>II, III</text>
-
• <text>I, III</text>
Pregunta 156
Pregunta
• In which type of PHP arrays the element values can be strings or integers?
Respuesta
-
• <text>numeric</text>
-
• <text>associative</text>
-
• <text>indexed</text>
-
• <text>none</text>
Pregunta 157
Pregunta
• In XML schema, the tag ________________ is used to specify foreign keys
Respuesta
-
• <text>xsd:keyref</text>
-
• <text>xsd:element</text>
-
• <text>xsd: unique</text>
-
• <text>xsd:foreignkey</text>
Pregunta 158
Pregunta
• NoSQL databases is used mainly for handling large volumes of ______________ data
Respuesta
-
unstructured
-
structured
-
semi-structured
-
all of the mentioned
Pregunta 159
Pregunta
• Point out the wrong statement
Respuesta
-
Non Relational databases require that schemas be defined before you can add data
-
NoSQL databases are built to allow the insertion of data without a predefined schema
-
NewSQL databases are built to allow the insertion of data without a predefined schema
-
All of the mentioned
Pregunta 160
Pregunta
• The ___ notation applies to user-defined subclasses of a specialization that must be ________, as illustrated by the specialization "every STUDENT must be either an GRADUATE_STUDENT, or a UNDERGRADUATE_STUDENT"
Respuesta
-
• <text>d, disjoint</text>
-
• <text>j, joint</text>
-
• <text>o, overlapping</text>
-
• <text>u, union</text>
Pregunta 161
Pregunta
• 190. The case of specialization what the same (real-world) entity may be a member of more than one subclass of the specialization for example, an alumnus may also be an employee and may also be a student pursuing an advanced degree (PERSON entity type, which is specialized into the subclasses {EMPLOYEE, ALUMNUS, STUDENT})
Respuesta
-
• <text> disjoint</text>
-
• <text> joint</text>
-
• <text>overlapping</text>
-
• <text>union</text>
Pregunta 162
Pregunta
• The case represents a single superclass/subclass relationship with more than one superclass, where the superclasses represent different entity types
Respuesta
-
• <text> disjoint</text>
-
• <text> joint</text>
-
• <text>overlapping</text>
-
• <text>union</text>
Pregunta 163
Pregunta
• This auto-global built-in array variable which provides the IP (Internet Protocol) address of the client user computer that is accessing the server, for example 129.107.61.8.
Respuesta
-
• <text>$_SERVER['SERVER_NAME']</text>
-
• <text>$_SERVER['REMOTE_ADDRESS']</text>
-
• <text>$_SERVER['REMOTE_HOST'] </text>
-
• <text>$_SERVER['PATH_INFO'] </text>
-
• <text>$_SERVER['QUERY_STRING']</text>
Pregunta 164
Pregunta
• This auto-global built-in array variable which provides the part of the URL address that comes after a backslash (/) at the end of the URL.
Respuesta
-
• <text>$_SERVER['SERVER_NAME']</text>
-
• <text>$_SERVER['REMOTE_ADDRESS']</text>
-
• <text>$_SERVER['REMOTE_HOST'] </text>
-
• <text>$_SERVER['PATH_INFO'] </text>
Pregunta 165
Pregunta
• This auto-global built-in array variable which provides the string that holds parameters in a URL after a question mark (?) at the end of the URL. This can hold search parameters, for example.
Respuesta
-
• <text>$_SERVER['SERVER_NAME']</text>
-
• <text>$_SERVER['QUERY_STRING']</text>
-
• <text>$_SERVER['REMOTE_ADDRESS']</text>
-
• <text>$_SERVER['PATH_INFO'] </text>
Pregunta 166
Pregunta
• This auto-global built-in array variablewhich provides the Web site name of the server computer where the PHP interpreter is running.
Respuesta
-
• <text>$_SERVER['SERVER_NAME']</text>
-
• <text>$_SERVER['REMOTE_ADDRESS']</text>
-
• <text>$_SERVER['REMOTE_HOST'] </text>
-
• <text>$_SERVER['PATH_INFO'] </text>
Pregunta 167
Pregunta
• What does PHP stands for
Respuesta
-
• <text>Personal Hypertext Processor</text>
-
• <text>PHP: Hypertext Preprocessor</text>
-
• <text>Private Home Page</text>
-
• <text>Private Hypertext Preprocessor</text>
Pregunta 168
Pregunta
• What does S in BASE refers to?
Respuesta
-
• <text>System Consistence</text>
-
• <text>System Availability</text>
-
• <text>Changing System</text>
-
• <text>System Stability</text>
Pregunta 169
Pregunta
• [What does the term "I" expands to in the term "ACID"?
Respuesta
-
• <text>Isolated</text>
-
• <text>Inseparable</text>
-
• <text>Indispensable</text>
-
• <text>Insulted</text>
Pregunta 170
Pregunta
• What does XML stand for?
Respuesta
-
• <text>eXtensible Markup Language</text>
-
• <text>Example Markup Language</text>
-
• <text>X-Markup Language</text>
-
• <text>eXtra Modern Link</text>
Pregunta 171
Pregunta
• What does XSL stand for?
Respuesta
-
• <text>eXtensible Stylesheet Language</text>
-
• <text>eXtra Style Language</text>
-
• <text>eXpandable Style Language</text>
-
• <text>eXtensible Style Listing</text>
Pregunta 172
Pregunta
• What is the correct syntax of the declaration which defines the XML version?
Respuesta
-
• <?xml version="1.0" />
-
• <?xml version="1.0"?>
-
• <xml version="1.0" />
Pregunta 173
Pregunta
• Which company did Cassandra was primarily developed in?
Respuesta
-
• <text>Apache</text>
-
• <text>Facebook</text>
-
• <text>Google</text>
-
• <text>Amazon</text>
Pregunta 174
Pregunta
• Which feature of CAP refers to load balancing
Respuesta
-
None of these
-
C
-
P
-
A
Pregunta 175
Pregunta
• Which of the following is correct about PHP
Respuesta
-
Key-value
-
Wide-column
-
Document
-
All of the mentioned
Pregunta 176
Pregunta
• Which of the following is correct about PHP
Respuesta
-
• PHP is a recursive acronym for "PHP: Hypertext Preprocessor".]
-
• PHP is a server side scripting language that is embedded in HTML
-
• It is used to manage dynamic content, databases, session tracking, even build entire e-commerce sites
-
• All of these statement
Pregunta 177
Pregunta
• Which of the following is correct about variable naming rules?
Respuesta
-
• Variable names must begin with a letter or underscore character
-
• A variable name can consist of numbers, letters, underscores.
-
• A variable name can consist of numbers, letters, underscores. you cannot use characters like + , - , % , ( , ) . & , etc in a variable name.
-
• All of these statement
Pregunta 178
Pregunta
• Which of the following is not a NoSQL database?
Respuesta
-
• <text>SQL Server</text>
-
• <text>MongoDB</text>
-
• <text>Cassandra</text>
-
• <text>None of the mentioned</text>.
Pregunta 179
Pregunta
• Which of the following method can be used to create a MySql database using PHP?
Respuesta
-
• <text>mysql_connect()</text>
-
• <text>mysql_query()</text>
-
• <text>mysql_close()</text>
-
• <text>None of the above</text>
Pregunta 180
Pregunta
• Which of them could not be applied to techniques for looping through arrays in PHP
Respuesta
-
• $courses = ('Database', 'OS', 'Graphics', 'Data Mining');
-
• $courses = array('Database', 'OS', 'Graphics', 'Data Mining');
-
• $teaching = array('Database' => 'Smith', 'OS' => 'Carrick', 'Graphics' => 'Kam');
-
• $teaching['Graphics'] = 'Benson';
Pregunta 181
Pregunta
• A key difference between structured and semistructured data concerns how the schema constructs (such as the names of attributes, relationships, and entity types) are handled.
Respuesta
- True
- False
Pregunta 182
Pregunta
• A large database typically has large transaction volumes and rates, is used in service sector industries, and runs 24/7
Respuesta
- True
- False
Pregunta 183
Pregunta
• A library of functions, also known as an application programming interface (API), is used to access the database
Respuesta
- True
- False
Pregunta 184
Pregunta
• A safer way to do inserts and other queries is through the use of placeholders (specified by the ? symbol) in PHP
Respuesta
- True
- False
Pregunta 185
Pregunta
• Associative array − An array with strings as index. This stores element values in association with key values rather than in a strict linear index order.
Respuesta
- True
- False
Pregunta 186
Pregunta
• In SQLJ, an iterator is a type of object associated with a collection (set or multiset) of records in a query result.
Respuesta
- True
- False
Pregunta 187
Pregunta
• In SQLJ, embedded SQL commands are preceded by #sql.
Respuesta
- True
- False
Pregunta 188
Pregunta
• In XML schema, it is possible to specify constraints that correspond to unique and primary key constraints in a relational database, as well as foreign keys constraints.
Respuesta
- True
- False
Pregunta 189
Pregunta
• Interfaces are defined to provide a common function names to the implementers. Different implementers can implement those interfaces according to their requirements. You can say, interfaces are skeletons which are implemented by developers.
Respuesta
- True
- False
Pregunta 190
Pregunta
• Numeric array − An array with a numeric index. Values are stored and accessed in linear fashion.
Respuesta
- True
- False
Pregunta 191
Pregunta
• OPEN CURSOR command is issued to indicate that we are done with processing the result of the query associated with that cursor.
Respuesta
- True
- False
Pregunta 192
Pregunta
• PHP is written in C and usually comes installed with Unix; for other operating systems, the PHP interpreter can be downloaded from http://www.php.net.
Respuesta
- True
- False
Pregunta 193
Pregunta
• The cursor is declared when the SQL query command is declared in the program. Later in the program, an OPEN CURSOR command fetches the query result from the database and sets the cursor to a position before the first row in the result of the query.
Respuesta
- True
- False
Pregunta 194
Pregunta
• The typical mechanisms for making an object persistent are naming and reachability
Respuesta
- True
- False
Pregunta 195
Pregunta
• The typical mechanisms for making an object persistent are naming and reachability
Respuesta
- True
- False
Pregunta 196
Pregunta
• XML attribute values must always be enclosed in quotes
Respuesta
- True
- False
Pregunta 197
Pregunta
• XML elements cannot be empty
Respuesta
- True
- False
Pregunta 198
Pregunta
• XML's goal is to replace HTML
Respuesta
- True
- False
Pregunta 199
Pregunta
• XQuery is the language for querying XML data
Respuesta
- True
- False
Pregunta 200
Pregunta
• What are the advantages and disadvantages of the embedded SQL approach.
Respuesta
-
• The main advantage is the query text is part of the source code can be checked for syntax errors and validated against the database schema at compile time. The program is quite readable. Since queries are known in advance, the choice of program variables to hold query results is simple.
-
• The main advantage is flexibility in generating queries at runtime. Also, the library of function calls approach is able to call multiple data program.
-
• The main disadvantage is the query text is part of the source code can be checked for syntax errors and validated against the database schema at compile time. The program is quite readable. Since queries are known in advance, the choice of program variables to hold query results is simple.
-
• Disadvantage are more complex programming, inability to do checking at compile time, and concerns about SQL runtime errors.
-
• Disadvantage are the loss of flexibility in changing the query the query at runtime and that all changes to queries must be recompiled.
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