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C175 Alternate Practice Test

Descripción

Database Foundations
Craig Willey
Test por Craig Willey, actualizado hace más de 1 año
Craig Willey
Creado por Craig Willey hace casi 5 años
820
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Resumen del Recurso

Pregunta 1

Pregunta
A record consists of a ____
Respuesta
  • character
  • collection of related records
  • set of one or more field
  • group of files

Pregunta 2

Pregunta
A DBMS performs several important functions that guarantee the integrity and consistency of the data in the database. Which of the following is NOT one of those functions?
Respuesta
  • Data integrity management
  • Data storage management
  • Data reports
  • Security management

Pregunta 3

Pregunta
Which item is unstructured data
Respuesta
  • A record representing one student
  • A video
  • A table that holds student data
  • A relational database that hold course registration data

Pregunta 4

Pregunta
Data is/are
Respuesta
  • information
  • raw facts
  • processed information
  • DBMS

Pregunta 5

Pregunta
Which classification is correct for the box marked “Registration” in the given E-R Diagram?
Image:
1 (binary/octet-stream)
Respuesta
  • Intersection data
  • Modality data
  • Cardinality data
  • Student data

Pregunta 6

Pregunta
Which type of relationship exists between Student and Course
Image:
2 (binary/octet-stream)
Respuesta
  • One-to-many binary
  • Many-to-many binary
  • One-to-many unary
  • Many-to-many unary

Pregunta 7

Pregunta
What is the E-R Diagram about an online pet food vendor showing?
Image:
3 (binary/octet-stream)
Respuesta
  • An Invoice Line can include many Items
  • An item can only be included in one Invoice Line
  • One Invoice Line must include a minimum of one and a maximum of one Item.
  • The relationship between Item and Invoice Line is many-to-many.

Pregunta 8

Pregunta
A pet owner can have many pets; a specific pet is linked to one pet owner.
Respuesta
  • One-to-one
  • One-to-many
  • Many-to-many
  • Associative

Pregunta 9

Pregunta
Database models were developed to ____
Respuesta
  • model real-world events or conditions
  • deposit data within a single file
  • keep data within multiple data repositories
  • allow DBMSs to maintain loose control over the database activities

Pregunta 10

Pregunta
What is the correct way to read the modality on the right side of the association?
Image:
4 (binary/octet-stream)
Respuesta
  • A maximum of one activity
  • A maximum of zero activities
  • A minimum of zero activities
  • A maximum of many activities

Pregunta 11

Pregunta
What is the modality of Volunteer?
Image:
5 (binary/octet-stream)
Respuesta
  • Two or more
  • Two
  • Dependent on registration date
  • At least one

Pregunta 12

Pregunta
What type of relationship is expressed with the phrase “A Painter paints one or more Paintings”?
Respuesta
  • 1:M
  • 1:1
  • M:1
  • M:N

Pregunta 13

Pregunta
The entity integrity rule requires that ____
Respuesta
  • all primary key entries are unique
  • a part of the key may be null
  • foreign key values do not reference primary key values
  • duplicate object values are allowed

Pregunta 14

Pregunta
What does the ‘refer’ in referential integrity mean ?
Respuesta
  • The relationships between entities and attributes, also called referrals
  • Reference points that databases place in each record during backups
  • A foreign key in a table must refer to a valid primary key in another table.
  • You delete a row in one table whose primary key does not have a matching foreign key value in another table

Pregunta 15

Pregunta
A table is perceived as a ____
Respuesta
  • flat structure
  • two-dimensional structure
  • linked structure
  • graph

Pregunta 16

Pregunta
Another word for the term “relation” is _____
Respuesta
  • datafile
  • data index
  • table
  • data query

Pregunta 17

Pregunta
DISTINT filters the results to remove duplicates. ORDER BY _____
Respuesta
  • does the same thing.
  • alters the order of the rows in a table.
  • modifies the presentation by changing the order of the result set.
  • removes duplicates in the table.

Pregunta 18

Pregunta
A primary key ____.
Respuesta
  • is a minimal superkey
  • is always the first field in each table
  • must be numeric
  • must be unique

Pregunta 19

Pregunta
A table can be logically connected to another table by defining a ____
Respuesta
  • hyperlink
  • common attribute
  • primary key
  • logic key

Pregunta 20

Pregunta
A relational operator that allows for the combination of information from two or more tables is known as the ____ operator
Respuesta
  • SELECT
  • PROJECT
  • JOIN
  • DIFFERENCE

Pregunta 21

Pregunta
Which of the following statements concerning the primary key is true?
Respuesta
  • All primary key entries are unique.
  • The primary key may be null.
  • The primary key is not required for all tables.
  • The primary key data do not have to be unique.

Pregunta 22

Pregunta
We can describe a link by observing that ____
Respuesta
  • a primary key of one table appears again as a primary key in a related table
  • a foreign key of one table appears again as a foreign key in a related table
  • a primary key of one table appears again as a foreign key in a related table
  • a foreign key of one table appears again as a primary key in a related table

Pregunta 23

Pregunta
When designing a new database, it is a good idea to ____
Respuesta
  • minimize data redundancy
  • include redundant fields
  • include a common field in all tables
  • use composite keys

Pregunta 24

Pregunta
An attribute (or combination of attributes) that uniquely identifies each entity in a table is called a ____
Respuesta
  • superkey
  • foreign key
  • master key
  • secondary key

Pregunta 25

Pregunta
A foreign key must ____.
Respuesta
  • be numeric
  • be unique
  • be defined in all tables within the database
  • match the value of a primary key in a related table

Pregunta 26

Pregunta
The ERD is used to graphically represent the ____ database model.
Respuesta
  • condensed
  • physical
  • logical
  • conceptual

Pregunta 27

Pregunta
A derived attribute ____.
Respuesta
  • must be stored physically within the database
  • need not be physically stored within the database
  • has many values
  • must be based on the value of three or more attributes

Pregunta 28

Pregunta
A relationship is an association between ____
Respuesta
  • objects
  • entities
  • databases
  • fields

Pregunta 29

Pregunta
A ____ key is a key that consists of more than one attribute.
Respuesta
  • primary
  • foreign
  • composite
  • domain

Pregunta 30

Pregunta
A ____ attribute is one that cannot be subdivided.
Respuesta
  • composite
  • atomic
  • single-valued
  • multivalued

Pregunta 31

Pregunta
If an entity can exist apart from one or more related entities, it is said to be ____-independent
Respuesta
  • existence
  • relationship
  • business
  • weak

Pregunta 32

Pregunta
A ____ relationship exists when three entities are associated
Respuesta
  • unary
  • binary
  • ternary
  • weak

Pregunta 33

Pregunta
The set of possible values for an attribute is a ____
Respuesta
  • domain
  • range
  • set
  • key

Pregunta 34

Pregunta
Which attribute(s) make up the primary key in the table definition: CLASS (CRS_CODE, CLASS_SECTION, CLASS_TIME, CLASS_ROOM, PROF_NUM)
Respuesta
  • CRS_CODE
  • CLASS_SECTION
  • CRS_CODE and CLASS_SECTION
  • There is no primary key

Pregunta 35

Pregunta
A table that has all key attributes defined, has no repeating groups, and all its attributes are dependent on the primary key, is said to be in ____
Respuesta
  • 1NF
  • 2NF
  • 3NF
  • 4NF

Pregunta 36

Pregunta
A table that is in 2NF and contains no transitive dependencies is said to be in ____
Respuesta
  • 1NF
  • 2NF
  • 3NF
  • 4NF

Pregunta 37

Pregunta
Data redundancy produces ____
Respuesta
  • slower lookups
  • robust design
  • efficient storage use
  • data integrity problems

Pregunta 38

Pregunta
Normalization works through a series of normal ____
Respuesta
  • schemas
  • entities
  • databases
  • forms

Pregunta 39

Pregunta
Dependencies based on only a part of a composite primary key are called ____ dependencies
Respuesta
  • primary
  • partial
  • incomplete
  • composite

Pregunta 40

Pregunta
Given the table EMP_PROJ (PROJ_NUM, EMP_NUM, PROJ_NAME, EMP_NAME, JOB_CLASS, CHG_HOURS, HOURS), which of the following is a partial dependency?
Respuesta
  • PROJ_NUM --> PROJ_NAME
  • JOB_CLASS --> CHG_HOUR
  • PROJ_NUM, EMP_NUM --> HOURS
  • PROJ_NUM, EMP_NUM --> CHG_HOURS

Pregunta 41

Pregunta
A relation is not in 1NF if
Respuesta
  • it has multiple candidate keys
  • all of the key attributes are defined
  • there are repeating groups in the table
  • all attributes are dependent on the primary key

Pregunta 42

Pregunta
The SQL command that lets you insert data into a table, one row at a time, is ____
Respuesta
  • INSERT
  • SELECT
  • COMMIT
  • UPDATE

Pregunta 43

Pregunta
The SQL command that enables you to make changes in the data is ____
Respuesta
  • INSERT
  • SELECT
  • COMMIT
  • UPDATE

Pregunta 44

Pregunta
To list all the contents of the PRODUCT table, you would use ____.
Respuesta
  • LIST * FROM PRODUCT;
  • SELECT * FROM PRODUCT;
  • DISPLAY * FROM PRODUCT;
  • SELECT ALL FROM PRODUCT;

Pregunta 45

Pregunta
Which command would you use when making corrections to the PRODUCT table?
Respuesta
  • CHANGE PRODUCT SET P_INDATE = '01/18/2004' WHERE P_CODE = '13-Q2/P2';
  • ROLLBACK PRODUCT SET P_INDATE = '01/18/2004' WHERE P_CODE = '13-Q2/P2';
  • EDIT PRODUCT SET P_INDATE = '01/18/2004' WHERE P_CODE = '13-Q2/P2';
  • UPDATE PRODUCT SET P_INDATE = '01/18/2004' WHERE P_CODE = '13-Q2/P2';

Pregunta 46

Pregunta
Which command would be used to delete the table row where the P_Code = '2238/QPD'?
Respuesta
  • DELETE FROM PRODUCT WHERE P_CODE = '2238/QPD';
  • REMOVE FROM PRODUCT WHERE P_CODE = '2238/QPD'
  • ERASE FROM PRODUCT WHERE P_CODE = '2238/QPD';
  • ROLLBACK FROM PRODUCT WHERE P_CODE = '2238/QPD';

Pregunta 47

Pregunta
Which command is used to select partial table contents?
Respuesta
  • SELECT <column(s)> FROM <Table name> WHERE <Item>;
  • LIST <column(s)> FROM <Table name> WHERE <Conditions>;
  • SELECT <column(s)> FROM <Table name> WHERE <Conditions>;
  • LIST<column(s)> FROM <Table name> WHERE <Item>;

Pregunta 48

Pregunta
Which query will output the table contents when the value of V_CODE is less than or equal to 21344?
Respuesta
  • SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE V_CODE <> 21344;
  • SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE V_CODE <=21344;
  • SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE V_CODE => 21344;
  • SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE V_CODE = 21344;

Pregunta 49

Pregunta
Which query will list all the rows in which the inventory stock dates occur on or after January 20, 2006?
Respuesta
  • SELECT P_DESCRIPT, P_QOH, P_MIN, P_PRICE, P_INDATE FROM PRODUCT WHERE P_INDICATE >= '01/20/2006'
  • SELECT P_DESCRIPT, P_QOH, P_MIN, P_PRICE, P_INDATE FROM PRODUCT WHERE P_INDICATE >= #01/20/2004#
  • SELECT P_DESCRIPT, P_QOH, P_MIN, P_PRICE, P_INDATE FROM PRODUCT WHERE P_INDICATE >= '20-JAN-2004'
  • SELECT P_DESCRIPT, P_QOH, P_MIN, P_PRICE, P_INDATE FROM PRODUCT WHERE P_INDICATE >= {01-20-2004}

Pregunta 50

Pregunta
What is the SQL syntax requirement to list the table contents for either V_CODE = 21344 or V_CODE = 24288?
Respuesta
  • SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE V_CODE = 21344 OR V_CODE <= 24288
  • SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE V_CODE = 21344 OR V_CODE => 24288
  • SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE V_CODE = 21344 OR V_CODE > 24288
  • SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE V_CODE = 21344 OR V_CODE = 24288

Pregunta 51

Pregunta
What is the command to join the P_DESCRIPT and P_PRICE fields from the PRODUCT table and the V_NAME, V_AREACODE, V_PHONE, and V_CONTACT fields from the VENDOR table where the value of V_CODE match?
Respuesta
  • SELECT P_DESCRIPT, P_PRICE, V_NAME, V_CONTACT, V_AREACODE, V_PHONE FROM PRODUCT, VENDOR WHERE PRODUCT.V_CODE <> VENDOR.V_CODE;
  • SELECT P_DESCRIPT, P_PRICE, V_NAME, V_CONTACT, V_AREACODE, V_PHONE FROM PRODUCT, VENDOR WHERE PRODUCT.V_CODE = VENDOR.V_CODE
  • SELECT P_DESCRIPT, P_PRICE, V_NAME, V_CONTACT, V_AREACODE, V_PHONE FROM PRODUCT, VENDOR WHERE PRODUCT.V_CODE <= VENDOR.V_CODE;
  • SELECT P_DESCRIPT, P_PRICE, V_NAME, V_CONTACT, V_AREACODE, V_PHONE FROM PRODUCT, VENDOR WHERE PRODUCT.V_CODE => VENDOR.V_CODE;

Pregunta 52

Pregunta
SQL allows the use of special operators in conjunction with the WHERE clause. A special operator used to check for similar character strings is ____.
Respuesta
  • BETWEEN
  • IS NULL
  • LIKE
  • IN

Pregunta 53

Pregunta
A table can be deleted from the database by using the ____ command.
Respuesta
  • DROP
  • DELETE
  • MODIFY
  • ERASE

Pregunta 54

Pregunta
UPDATE tablename ***** [WHERE conditionlist]; What command replaces the ***** in the above statement?
Respuesta
  • SET columnname = expression
  • columnname = expression
  • expression = columnname
  • LET columnname = expression

Pregunta 55

Pregunta
A ____ join returns rows with matching values and includes all rows from both tables (T1 and T2) with unmatched values.
Respuesta
  • natural
  • cross
  • full outer
  • left outer

Pregunta 56

Pregunta
During which step in the extract, transform, load (ETL) process are raw data sets aggregated?
Respuesta
  • Transformation
  • Extraction
  • Loading
  • Denormalization

Pregunta 57

Pregunta
Which is an important issue associated with the loading component of extract, transform, load (ETL)?
Respuesta
  • Mapping keys from one system to another
  • Monitor refreshing volume and frequency
  • Determining the content of the data
  • Denormalizing and renormalizing data

Pregunta 58

Pregunta
A database includes the table shown above in the exhibit. Each teacher is associated with exactly one campus. The address in the table is the address for the campus where the teacher teaches. What change would you need to make to normalize the database to the third normal form (3NF)?
Image:
1 (binary/octet-stream)
Respuesta
  • Combine the FirstName and LastName columns into a single column.
  • Combine the Campus, Address, City, State, Country, and PostalCode columns into a single column.
  • Create a separate table for campus address information. Use the Campus as the primary key. Add a TeacherID column to the table and relate it to the Teacher ID column in the Teachers table.
  • Create a separate table for campus address information. Use Campus as the primary key for the table. Create a foreign key in the Teachers table that relates teacher to the campus.

Pregunta 59

Pregunta
Which statement will remove all rows from the Materials table that have a Status value of ‘Obsolete’ but do not have a value for the VendorID column?
Respuesta
  • DELETE Materials WHERE Status = ‘Obsolete’ OR VendorID IS NULL
  • DELETE FROM Materials WHERE Status = ‘Obsolete’ AND VendorID IS NULL
  • DELETE MaterialID, Description, Status, VendorID FROM Materials WHERE Status = ‘Obsolete’ AND VendorID IS NULL
  • DELETE FROM Materials WHERE Status = ‘Obsolete’ WHERE VendorID IS NULL

Pregunta 60

Pregunta
The TestScores table is shown in the exhibit and has these characteristics: Each student has a unique StudentID that references the Students table. A specific test can be taken more than once. Each instructor has a unique InstructorID that references the Instructors table Each student may take multiple tests on the same date. Each student may take tests on multiple dates. What column or columns should you use for the primary key?
Image:
2 (binary/octet-stream)
Respuesta
  • StudentID, Date
  • StudentID, Test, Date, InstructorID
  • StudentID, Test, and Date
  • Test

Pregunta 61

Pregunta
You are creating a relational database to store information about instructors and the courses that each instructor teaches. Each course is taught by a single instructor. You have created an Instructor table and a Course table as shown above. You need to create a relationship between the Instructor table and the Course table. You need to keep duplicate data to a minimum. What should you do?
Image:
3 (binary/octet-stream)
Respuesta
  • Create a new column in the Instructor table.
  • Create new columns in the Instructors table for each course taught
  • Create a new table that includes two columns.
  • Create a new column in the Course table

Pregunta 62

Pregunta
Which of the following is structured data?
Respuesta
  • Images
  • Email Attachments
  • Records in a database
  • Audio/Video

Pregunta 63

Pregunta
Which kind of relationship does the diagram depict?
Image:
4 (binary/octet-stream)
Respuesta
  • Unary one-to-many
  • Binary many-to-many
  • Unary many-to-many
  • Binary one-to-many

Pregunta 64

Pregunta
Which kind of relationship does the diagram depict?
Image:
5 (binary/octet-stream)
Respuesta
  • Unary one-to-many
  • Binary many-to-many
  • Unary one-to-one
  • Binary one-to-many

Pregunta 65

Pregunta
What is the modality of appointment?
Image:
6 (binary/octet-stream)
Respuesta
  • At least one
  • Dependent on the quantity
  • Two
  • Two or more

Pregunta 66

Pregunta
What form is this table in?
Image:
7 (binary/octet-stream)
Respuesta
  • Unnormalized
  • First normal form
  • Second normal form
  • Third normal form

Pregunta 67

Pregunta
What form is this table in?
Image:
1 (binary/octet-stream)
Respuesta
  • Unnormalized
  • First normal form
  • Second normal form
  • Third normal form

Pregunta 68

Pregunta
What form is this table in?
Image:
2 (binary/octet-stream)
Respuesta
  • Unnormalized
  • First normal form
  • Second normal form
  • Third normal form

Pregunta 69

Pregunta
What form is this table in?
Image:
3 (binary/octet-stream)
Respuesta
  • Unnormalized
  • First normal form
  • Second normal form
  • Third normal form

Pregunta 70

Pregunta
Affinity grouping question – Where does affinity grouping occur in data mining?
Respuesta
  • Between objects
  • Among clusters
  • Among entities and target applications
  • Between entity group names

Pregunta 71

Pregunta
How is prediction distinguished from estimation in data mining?
Respuesta
  • Estimation assumptions do not need to be tested.
  • Prediction is used to look at historical data only.
  • Estimation divides small collections of entities into smaller groups of similar entities.
  • Prediction classifies objects according to an expected future behavior.

Pregunta 72

Pregunta
During which step in the extract, transform, load (ETL) process are raw data sets aggregated?
Respuesta
  • Conversion
  • Loading
  • Extraction
  • Transformation
  • Denormalization

Pregunta 73

Pregunta
Which issues is focused on the loading component of extract, transform, load (ETL)?
Respuesta
  • Monitor refreshing volume and frequency
  • Mapping keys from one system to another
  • Determining the content of the data
  • Denormalizaing and renormalizing the data

Pregunta 74

Pregunta
How can a data warehouse assist in an organization’s data analysis?
Respuesta
  • By serving as the primary source of information that feeds analytical processing
  • By storing data that is no longer in use but may be needed for future analyses
  • By providing a place where unnormalized data can reside before it is processed
  • By providing a physical space where groups of servers can process data on a large scale

Pregunta 75

Pregunta
Which set of results should a company expect from implementing a business intelligence system?
Respuesta
  • Reduced hardware redundancy and decreased workloads
  • Riskier capital and asset investments and increased throughput
  • Increased profitability and reduced hardware redundancy
  • Increased profitability and increased throughput.
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