Test
SDP 6 (2)
Preguntas del test (141)
1The ___________ 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
- Ao LEFT OUTER JOIN
- Bo RIGHT OUTER JOIN
- Co FULL OUTER JOIN
- Do LEFT INNER JOIN
2If a relation schema has more than one key, each is called a _______ key.
- Ao Candidate
- Bo Primary
- Co Public
- Do Foreign
3A _________conflict arises when an attribute may have different domains in two schemas, e.g. pounds vs kilograms
- Ao Domain
- Bo Type
- Co Norming
- Do Constraints
4UML _________ diagrams describe the dynamic relationships among components
- Ao Behavioral
- Bo Structural
- Co Class
- Do Direct
5Objects 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
- Ao persistent object
- Bo instance variable
- Co attribute
- Do object structure
6_____ is the term used to refer to the problems that occur because of difference between the database model and the programming language model.
- Ao Independence mismatch
- Bo Denormalisation
- Co Redundancy
- Do Duplication
7A __________________ is typically used to loop over the tuples in a query result
- Ao Cursor {iterator variable}
- Bo Shared variable
- Co Communication variables
- Do fetch
8NULL values may mean value unknown, value exists but isn't available, and attribute does not apply to this tuple (value undefined)
- AVerdadero
- BFalso
9A THETA JOIN uses any of the comparison operators =,<,> or (not equal)
- AVerdadero
- BFalso
10For structured data, the schema information is mixed in with the data values, so it is sometimes referred to as self-describing data
- AVerdadero
- BFalso
11The main advantage of using a function call interface is that it makes it easier to access multiple databases within the same application program
- AVerdadero
- BFalso
12In PHP, Interpolating variables may occur within double-quoted or single-quoted strings
- AVerdadero
- BFalso
13In PHP, the $d->query function takes an SQL command as its string argument and sends it to the database server for execution.
- AVerdadero
- BFalso
14The ________________ property ensures that either all the database operations in a transaction are executed or none are
- Ao Atomicity
- Bo Transaction
- Co Isolation
- Do Concurrency
15_______occurs when the same data is stored multiple times
- Ao Redundancy
- Bo Normalisation
- Co Denormalization
- Do Persistent
16Creating a database design that only stores each logical data item in only one place is the database is called______
- Ao Redundancy
- Bo Normalization
- Co Denormalization
- Do Persistent
17The ________________ property allows several users to update the same data in a controlled manner so that result of the updates is correct
- Ao Atomicity
- Bo Transaction
- Co Isolation
- Do Concurrency
18An entity cannot exist in a database merely by being a member of a subclass, it must also be a member of the superclass
- AVerdadero
- BFalso
19An entity that is a member of a subclass may inherit one, some, or all the attributes of the entity as a member of the superclass.
- AVerdadero
- BFalso
20The theoretical basis of the relational data model is set theory and first-order predicate logic
- AVerdadero
- BFalso
21Semantic integrity constraints may be enforced using mechanisms called triggers and assertions.
- AVerdadero
- BFalso
22When mapping a binary M:N relationship type R, create a new relation S to represent R, including as foreign key attributes in S the primary keys of the relations that are the participating entity types (their combination in S is the composite primary key of S).
- AVerdadero
- BFalso
23$_SESSION − An associative array containing session variables available to the current script
- AVerdadero
- BFalso
24PHP 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
- AVerdadero
- BFalso
25The 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
- AVerdadero
- BFalso
26SQLJ was developed after JDBC, which is used for accessing SQL data- bases from Java using function calls
- AVerdadero
- BFalso
27Most NoSQL databases support automatic __________, meaning that you get high availability and disaster recovery
- Aprocessing
- Bscalability
- Creplication
- DAll of the mentioned
28The Web Services Architecture supports interaction between a service provider, service requestor, and service registry
- AVerdadero
- BFalso
29Multi-line PHP comments start with // and end with #.
- AVerdadero
- BFalso
30Define types of abstractions by the relations as "A is made of/composed of B,C,D"
- AClassification
- BAggregation
- CGeneralization
- DSpecialization
31FETCH 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>
- AVerdadero
- BFalso
32Define types of abstractions by the relations as "B,C,D are special cases of A"
- AClassification
- BAggregation
- CGeneralization
- DSpecialization
33A JDBC driver is basically an implementation of the function calls specified in the JDBC application programming interface (API) for a particular vendor's RDBMS
- AVerdadero
- BFalso
34In PHP, a numeric array associates a numeric index with each element in the array.
- AVerdadero
- BFalso
35Before being able to process JDBC function calls with Java, it is necessary to import the JDBC class libraries, which are called java.sql.*.
- AVerdadero
- BFalso
36How can you change "Hansen" into "Nilsen" in the "LastName" column in the Persons table?
- AUPDATE Persons SET LastName='Hansen' WHERE LastName='Nilsen'
- BUPDATE Persons SET LastName='Nilsen' WHERE LastName='Hansen'
- CMODIFY Persons SET LastName='Hansen' WHERE LastName='Nilsen'
- DUPDATE FROM Persons SET LastName='Nilsen' WHERE LastName='Hansen'
37Publisher 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?
- AINSERT INTO Publisher (name) values ('O'Reilly');
- BINSERT INTO Publisher (name) values ('O Reilly');
- CINSERT INTO Publisher (name) values ('OReilly');
- DINSERT INTO Publisher (name) values ('O-Reilly');
38What is the correct order of clauses for a proper SQL query?
- ASELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY
- BSELECT, FROM, WHERE, GROUP BY, ORDER BY, HAVING
- CSELECT, FROM, GROUP BY, WHERE, HAVING, ORDER BY
- DSELECT, FROM, WHERE, HAVING, GROUP BY, ORDER BY
- ESELECT, FROM, ORDER BY, WHERE, GROUP BY, HAVING
39Which clause indicates the table(s) from which data is to be retrieved?
- AFROM
- BSELECT
- CWHERE
- DGROUP BY
- EHAVING
40Which clause is executed first in a SQL query?
- A• WHERE
- B• SELECT
- C• ON
- D• TOP
- E• FROM
41Which of the following DROP statements is INCORRECT?
- A• DROP TABLE
- B• DROP DATABASE
- C• DROP ROW
- D• DROP INDEX
42Which of the following is NOT a language element of SQL?
- AExpression
- BData mining
- CQuery
- DStatement
- EClause
43Which operator is used to search for a specified pattern in a column?
- AWHERE
- BLIKE
- CALIASE
- DPATTERN
44Which operator is used to select values within a range?
- ARANGE
- BAND
- CBETWEEN
- DOR
45Which term is used to describe data organized in rows and columns?
- AQuery
- BProgram
- CIndex
- DTable
46With SQL, how can you delete the records where the "Address" is "Almaty" in the Student Table?
- ADROP ROW Student ='Almaty' FROM Address
- BDELETE FROM Student ROW Address ='Almaty'
- CDROP ROW Address ='Almaty' FROM Student
- DDELETE ROW Address ='Almaty' FROM Student
47With SQL, how can you return all the records from a table named "Persons" sorted descending by "FirstName"?
- ASELECT * FROM Persons GROUP BY FirstName DESC
- BSELECT * FROM Persons WHERE FirstName DESC
- CSELECT * FROM Persons ORDER BY FirstName
- DSELECT * FROM Persons ORDER BY FirstName DESC
48With SQL, how can you return the number of records in the "Employee" table?
- ASELECT COUNT(*) FROM Employee
- BSELECT * FROM Employee GROUP BY
- CSELECT NUM(*) FROM Employee
- DRETURN COUNT(*) FROM Employee
49With SQL, how do you select all the records from a table named "Persons" where the value of the column "FirstName" starts with an "a"?
- ASELECT * FROM Persons WHERE FirstName LIKE 'a%';
- BSELECT * FROM Persons WHERE FirstName LIKE '%a%';
- CSELECT All FROM Persons WHERE FirstName LIKE='a';
- DSELECT * FROM Persons WHERE FirstName LIKE 'a*';
50With SQL, how do you select all the records from a table named "Persons" where the "FirstName" is "Alma" and the "LastName" is "Alimova"?
- ASELECT * FROM Persons WHERE FirstName=' Alma ' AND LastName=' Alimova'
- BSELECT * FROM Persons WHERE FirstName=' Alma ' OR LastName=' Alimova'
- CSELECT FROM Persons WHERE FirstName=' Alma ' AND LastName=' Alimova'
- DSELECT * FROM Persons HAVING FirstName=' Alma ' AND LastName=' Alimova'
51Which of the following is not a NoSQL database ?
- ASQL Server
- BMongoDB
- CCassandra
- DNone of the mentioned
52Which of the following is a NoSQL Database Type ?
- ASQL
- BDocument databases
- CJSON
- DAll of the mentioned
53Which of the following is a wide-column store ?
- ACassandra
- BRiak
- CMongoDB
- DRedis
54An ODMS provides a unique identity to each independent object stored in the database via a unique, system-generated ________
- Aobject identifier (OID)
- Bliterals
- Cindirect pointer
- Dconstructor
55Define types of abstractions by the relations as "A is a member of class B
- AClassification
- BAggregation
- CGeneralization
- DSpecialization
56Define types of abstractions by the relations as "B is-an A, C is-an A, D is-an A"
- AClassification
- BAggregation
- CGeneralization
- DSpecialization
57How will you close a MySql database using PHP?
- Amysql_destroy
- Bmysql_exit
- Cmysql_end
- Dmysql_close
58How will you concatenate two strings?
- AUsing . operator
- BUsing + operator
- CUsing add() function
- DUsing append() function
59How will you connect a MySql database using PHP?
- Amysql_connection
- Bmysql_query
- Cmysql_fetch_array
- Dmysql_connect
60How will you destroy a session in PHP?
- Asession_destroy()
- Bdestroy_session()
- C$_SESSION['destroy']
- D$_SESSION['']
61How will you start a session in PHP?
- Asession_start()
- Bstart_session()
- C$_SESSION['start']
- D$_SESSION['']
62How will you unset a single session variable?
- A![CDATA[<?phpunset($_SESSION['counter']);?>]]
- B![CDATA[<?phpisset($_SESSION['counter']); ?>]]
- C$_SESSION['unset']
- D$_SESSION['']
63Identify factors to consider in choosing one DBMS over another.
I. Organization-wide adoption of a certain philosophy (data model, vendor, methodology, tools).
II. Familiarity of personnel with the system.
III. Availability of vendor services.- AI,II
- BI,II,III
- CII,III
- DI,III
64In which type of PHP arrays the element values can be strings or integers?
- Anumeric
- Bassociative
- Cindexed
- Dnone
65In XML schema, the tag ________________ is used to specify foreign keys
- Axsd:keyref
- Bxsd:element
- Cxsd: unique
- Dxsd:foreignkey
66NoSQL databases is used mainly for handling large volumes of ______________ data
- Aunstructured
- Bstructured
- Csemi-structured
- Dall of the mentioned
67Point out the wrong statement
- ANon Relational databases require that schemas be defined before you can add data
- BNoSQL databases are built to allow the insertion of data without a predefined schema
- CNewSQL databases are built to allow the insertion of data without a predefined schema
- DAll of the mentioned
68The ___ 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"
- Ad, disjoint
- Bj, joint
- Co, overlapping
- Du, union
69The 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})
- Adisjoint
- Bjoint
- Coverlapping
- Dunion
70This 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.
- A$_SERVER['SERVER_NAME']
- B$_SERVER['REMOTE_ADDRESS']
- C$_SERVER['REMOTE_HOST']
- D$_SERVER['PATH_INFO']
- E$_SERVER['QUERY_STRING']
71This auto-global built-in array variable which provides the part of the URL address that comes after a backslash (/) at the end of the URL.
- A$_SERVER['SERVER_NAME']
- B$_SERVER['REMOTE_ADDRESS']
- C$_SERVER['REMOTE_HOST']
- D$_SERVER['PATH_INFO']
- E$_SERVER['QUERY_STRING']
72This 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
- A$_SERVER['SERVER_NAME']
- B$_SERVER['REMOTE_ADDRESS']
- C$_SERVER['REMOTE_HOST']
- D$_SERVER['PATH_INFO']
- E$_SERVER['QUERY_STRING']
73This auto-global built-in array variablewhich provides the Web site name of the server computer where the PHP interpreter is running.
- A$_SERVER['SERVER_NAME']
- B$_SERVER['REMOTE_ADDRESS']
- C$_SERVER['REMOTE_HOST']
- D$_SERVER['PATH_INFO']
- E$_SERVER['QUERY_STRING']
74What does PHP stands for
- APersonal Hypertext Processor
- BPHP: Hypertext Preprocessor
- CPrivate Home Page
- DPrivate Hypertext Preprocessor
75What does S in BASE refers to?
- ASystem Consistence
- BSystem Availability
- CChanging System
- DSystem Stability
76[What does the term "I" expands to in the term "ACID"?
- AIsolated
- BInseparable
- CIndispensable
- DInsulted
77What does XML stand for?
- AeXtensible Markup Language
- BExample Markup Language
- CX-Markup Language
- DeXtra Modern Link
78What does XSL stand for?
- AeXtensible Stylesheet Language
- BeXtra Style Language
- CeXpandable Style Language
- DeXtensible Style Listing
79What is the correct syntax of the declaration which defines the XML version?
- A<?xml version="1.0" />
- B<?xml version="1.0"?>
- C<xml version="1.0" />
80Which company did Cassandra was primarily developed in?
- AApache
- BFacebook
- CGoogle
- DAmazon
81Which feature of CAP refers to load balancing
- ANone of these
- BС
- CА
- DР
82Which of the following are the simplest NoSQL databases
- AKey-value
- BWide-column
- CDocument
- DAll of the mentioned
83Which of the following is correct about PHP
- APHP is a recursive acronym for "PHP: Hypertext Preprocessor".]
- BPHP is a server side scripting language that is embedded in HTML
- CIt is used to manage dynamic content, databases, session tracking, even build entire e-commerce sites
- DAll of these statement
84Which of the following is correct about variable naming rules?
- AVariable names must begin with a letter or underscore character.
- BA variable name can consist of numbers, letters, underscores.
- Cyou cannot use characters like + , - , % , ( , ) . & , etc in a variable name.
- DAll of these statement
85Which of the following is not a NoSQL database?
- ASQL Server
- BMongoDB
- CCassandra
- DNone of the mentioned
86Which of the following method can be used to create a MySql database using PHP?
- Amysql_connect()
- Bmysql_query()
- Cmysql_close()
- DNone of the above
87Which of them could not be applied to techniques for looping through arrays in PHP
- A$courses = ('Database', 'OS', 'Graphics', 'Data Mining');
- B$courses = array('Database', 'OS', 'Graphics', 'Data Mining');
- C$teaching = array('Database' => 'Smith', 'OS' => 'Carrick', 'Graphics' => 'Kam');
- D$teaching['Graphics'] = 'Benson';
- E$alt_row_color = array('blue', 'yellow');
88A key difference between structured and semistructured data concerns how the schema constructs (such as the names of attributes, relationships, and entity types) are handled.
- AVerdadero
- BFalso
89A large database typically has large transaction volumes and rates, is used in service sector industries, and runs 24/7
- AVerdadero
- BFalso
90A library of functions, also known as an application programming interface (API), is used to access the database
- AVerdadero
- BFalso
91A safer way to do inserts and other queries is through the use of placeholders (specified by the ? symbol) in PHP
- AVerdadero
- BFalso
92Associative array − An array with strings as index. This stores element values in association with key values rather than in a strict linear index order.
- AVerdadero
- BFalso
93In SQLJ, an iterator is a type of object associated with a collection (set or multiset) of records in a query result.
- AVerdadero
- BFalso
94In SQLJ, embedded SQL commands are preceded by #sql.
- AVerdadero
- BFalso
95In 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.
- AVerdadero
- BFalso
96Interfaces 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.
- AVerdadero
- BFalso
97Numeric array − An array with a numeric index. Values are stored and accessed in linear fashion.
- AVerdadero
- BFalso
98OPEN CURSOR command is issued to indicate that we are done with processing the result of the query associated with that cursor.
- AVerdadero
- BFalso
99PHP 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.
- AVerdadero
- BFalso
100The 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
- AVerdadero
- BFalso
101The typical mechanisms for making an object persistent are naming and reachability
- AVerdadero
- BFalso
102XML attribute values must always be enclosed in quotes
- AVerdadero
- BFalso
103XML elements cannot be empty
- AVerdadero
- BFalso
104XML's goal is to replace HTML
- AVerdadero
- BFalso
105XQuery is the language for querying XML data
- AVerdadero
- BFalso
106The case represents a single superclass/subclass relationship with more than one superclass, where the superclasses represent different entity types
- Adisjoint
- Bjoint
- Coverlapping
- Dunion
107When a database design is in ____________, each value in a tuple is in atomic value.
- AFirst normal form
- BSecond normal form
- CThird normal form
- DForth normal form
108Redundancy leads to three potential problems. Briefly describe each of the three.
- ADuplication of effort
- BStorage space is wasted
- CMultiple occurrences of data may become inconsistent
109What two things does minimizing redundancy imply
- AMinimizing redundant storage of the same information.
- BReducing the need for multiple updates to maintain consistency across multiple copies of the same information.
110What are the four informal guidelines that may be used to measure the quality of a relation schema design?
- AMaking sure the semantics of the attributes is clear in the schema.
- BReducing the redundant information in tuples.
- CReducing the NULL values in tuples.
- DDisallowing the possibility of generating spurious tuples.
111What are the three goals of database design?
- ASatisfy the information content requirements of the specified users and applications.
- BProvide a natural and easy-to-understand structuring of the information.
- CSupport processing requirements and any performance objectives
112Identify two of the three factors to consider in choosing one DBMS over another
- AOrganization-wide adoption of a certain philosophy (data model, vendor, methodology, tools).
- BFamiliarity of personnel with the system
- CAvailability of vendor services
113Identify the three criteria to guide the choice of physical database design options
- AResponse time.
- BSpace utilization
- CTransaction throughput.
114A join operation joins _____ tables into _____.
- Athree, two
- Bthree, one
- Cfour, two
- Dtwo, one
115A primary key should be defined as:
I. NULL
II. NOT NULL
III. Optional- AI, II
- BI, III
- CII only
- DI, II, III
116A subquery in an SQL SELECT statement is enclosed in:
- Abraces -- {...}.
- BCAPITAL LETTERS
- Cparenthesis -- (...)
- Dbrackets -- [...].
117SQL query and modification commands make up a(n) ________ .
- ADML
- BDDL
- CHTML
- DXML
118The command to eliminate a table from a database is:
- A• REMOVE TABLE TableName
- B• DROP TABLE TableName
- C• DELETE TABLE TableName
- D• UPDATE TABLE TableName
119________ stores are used to store information about networks, such as social connections.
- A• Key-value
- B• Wide-column
- C• Graph
120A ___________ is an indirect functional dependency, one in which X->Z only by virtue of X->Y and Y->Z
- A• Multivalued Dependencies
- B• Join Dependency
- C• Trivial Functional Dependency
- D• Transitive Dependencies
121A table is in 3NF if it is in 2NF and if it has no ____________
- A• Functional Dependencies
- B• Transitive Dependencies
- C• Trivial Functional Dependency
- D• Multivalued Dependencies
122A table is in BCNF if it is in 3NF and if every determinant is a ___________ key.
- A• Dependent
- B• Normal
- C• Candidate
- DBoth Normal and Candidate
123Anomalies are avoided by splitting the offending relation into multiple relations, is also known as
- A• Accupressure
- B• Decomposition
- C• Both Decomposition and Precomposition
- D• Precomposition
124Every time attribute A appears, it is matched with the same value of attribute B, but not the same value of attribute C. Therefore, it is true that:
- AA-->B
- BA-->C
- CA-->(B,C)
- D(B,C)-->A
125For select operation the ________ appear in the subscript and the ___________ argument appears in the parenthesis after the sigma.
- A• Predicates, relation
- B• Relation, Predicates
- C• Operation, Predicates
- D• Relation, Operation
126If X -> Y, which of the following would make Y fully dependent on X?
- A• X consists of multiple attributes
- B• Y is a single attribute
- C• Y consists of multiple attributes
- D• X is a single attribute
127In a given relationship R, if an attribute A uniquely defines all other attributes, then the attribute A is a key attribute which is also known as the _________ key.
- A• Candidate
- B• Join
- C• Functional
- D• None of the Mentioned
128In EER modeling, specialization is the process of generating
- A• entities out of attributes
- B• attributes out of entities
- C• subclasses out of superclasses
- D• superclasses out of subclasses
129In precedence of set operators the expression is evaluated from
- A• Left to left
- B• Left to right
- C• Right to left
- D• From user specification
130The ___________ operation, denoted by −, allows us to find tuples that are in one relation but are not in another.
- A• Union
- B• Set-difference
- C• Difference
- D• Intersection
131The functional dependency X -> Y is true if
- Aa value of X uniquely determines a value of Y
- Bthe value of Y depends on the collective values of X
- Cthe value of X depends on the collective values of Y
- Da value of Y uniquely determines a value of X
132The result of a set difference operation r - s will be
- Athose tuples that are in s but not in r
- Bthose tuples that are in r but not in s
- Ctuples in s after deducting their values by the corresponding values in the tuples in r
- Dtuples in r after deducting their values by the corresponding values in the tuples in s
133What does a projection operation do?
- AIt extends the number of rows in a table.
- BIt extends the number of columns in a table
- CIt selects columns from a table
- DIt selects rows from a table.
134When the values in one or more attributes being used as a foreign key must exist in another set of one or more attributes in another table, we have created a(n)
- ATransitive Dependency
- BInsertion Anomaly
- CReferential Integrity Constraint
- DNormal Form
135Which is a join condition contains an equality operator
- AEquijoins
- BCartesian
- CNatural
- DLeft
136Which is a unary operation
- ASelection operation
- BPrimitive operation
- CProjection operation
- DGeneralized selection
137Which of the following is a fundamental operation in relational algebra
- ASet intersection
- BNatural join
- CAssignment
- DNone of the mentioned
138Which of the following is not a restriction for a table to be a relation?
- AThe cells of the table must contain a single value
- BThe columns must be ordered
- CNo two rows in a table may be identical
139Which of the following is used to denote the selection operation in relational algebra?
- APi
- BSigma
- CLambda
- DOmega
140Y is transitively dependent on X, if
- AX -> A, B and Y -> A, B
- BX -> Y and A -> Y
- CX -> A, B and A -> Y
- DX -> Y and Y -> A
141For two tables to be union compatible, corresponding columns from each table should have which of the following?
- Athe same domain
- Bthe same name
- Cdifferent domains
- Ddifferent names
Información
- Descripción
- - at Test sobre SDP 6 (2), creado por хомяк убийца el 17/12/2017.
- Autor
- хомяк убийца
- Idioma
- English
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