C170, WGU Full Study Pack| WITH COMPLETE SOLUTIONS

C170, WGU Full Study Pack| WITH COMPLETE SOLUTIONS
A salesperson is authorized to sell many products and a product can be sold by many
salespersons.
Which kind of binary relationship does this scenario describe? Correct Answer: Many-to-many

Which two examples are attributes? Correct Answer: An employee number
A meeting code

Which delete rule sets column values in a child table to a missing value when the matching data
is
deleted from the parent table? Correct Answer: Set-to-Null

member_id INT UNSIGNED NOT NULL AUTO_INCREMENT,
PRIMARY KEY (member_id),
last_name VARCHAR(20) NOT NULL,
first_name VARCHAR(20) NOT NULL,
suffix VARCHAR(5) NULL,
expiration DATE NULL,
Which two columns are created as something other than variable-length strings in this statement?
Correct Answer: member_id
expiration

This database table has ten different employee numbers in the first column. Employee_ID is the
primary
key. In addition, it has ten different names in the second column and two office addresses
repeated five
times each in the third column.
Which action should be used to translate this data into third normal form? Correct Answer:
Move the data from the third column into its own table.

A database manager starts to convert data that has been normalized into a form that conforms to
the
relational model. A simple primary key has been established and all the repeating groups have
been
deleted.
In which form is this data? Correct Answer: Second normal form

Two attributes in two related tables have the exact same domain of values. The attribute is a
primary
key in one table.
Which kind of key is the attribute in the other table? Correct Answer: Foreign

SELECT PRODNUM, PRODNAME
FROM PRODUCT

,Which line should be added to the end of the statement to return the product numbers and
product
names for products that cost 20 dollars? Correct Answer: WHERE PRODCOST=20;

What does WHERE identify in a basic SQL SELECT statement? Correct Answer: The rows to
be included

Refer to the given SQL statement.
SELECT EMPNUM
FROM EMPLOYEE
Which line added to the end of the statement returns employee numbers of at least 1000? Correct
Answer: WHERE EMPNUM >= 1000;

SELECT PRODNUM, SUM(QUANTITY)
FROM SALESPERSON
Which line, when added to the end of the statement, returns the total number of each kind of
product
by product number? Correct Answer: GROUP BY PRODNUM;

Which data definition language statement affects databases or objects in them? Correct Answer:
ALTER

What does the DELETE statement do? Correct Answer: It removes rows from a table.

Which condition must be in effect to use the INSERT INTO ... VALUES syntax for an INSERT
statement? Correct Answer: The VALUES list must contain a value for each non-null valued
column in the
table.

CREATE TABLE mytbl
(
f FLOAT(10,4),
c CHAR(15) NOT NULL DEFAULT 'none',
i TINYINT UNSIGNED NULL
);
Which kind of data type is FLOAT in this statement? Correct Answer: Decimal

Which two SQL data types can represent images or sounds? Correct Answer: TINYBLOB
BINARY

CREATE TABLE CUSTOMER
(CustomerID INT NOT NULL AUTO_INCREMENT,
LastName VARCHAR(100) NOT NULL,
FirstName VARCHAR(100) NOT NULL,
PRIMARY KEY ( CustomerID ));
Which component of the command indicates the table's name? Correct Answer: CUSTOMER

,Which method creates an empty copy of a table and then populates it from the original table?
Correct Answer: CREATE TABLE ... LIKE followed by INSERT INTO ... SELECT :

ALTER TABLE tbl_name action [, action ] ... ;
What does this syntax allow?
Choose 2 answers Correct Answer: Dropping indexes
Changing column data types

Which command eliminates a table? Correct Answer: DROP TABLE

Why is a view used to give controlled access to data? Correct Answer: To restrict access to
persons retrieving and modifying sensitive information

A database manager plans to create a view of a table and has these two elements: Correct
Answer: The SELECT privilege for every column referred to elsewhere in the statement

SELECT product_name, product_number, mfg_city FROM product;
Which statement, when added before this statement, generates a view? Correct Answer:
CREATE VIEW viewprod AS

What is the proper command to change a view? Correct Answer: ALTER VIEW

DROP VIEW EMPLOYEE;
What happens as a result of the execution of this statement to the HRDB table on which the
EMPLOYEE view is based? Correct Answer: The view is discarded.

When a product is deleted from the product table, all corresponding rows for the product in the
pricing
table are deleted automatically as well.
What is this referential integrity technique called? Correct Answer: Cascaded delete

CREATE TABLE 'test1' (
contact_id INT(10),
name VARCHAR(10),
event_id INT(5),
Which command should be added to the end to make the event_id attribute the primary key
within a
CREATE TABLE statement? Correct Answer: PRIMARY KEY (event_id));

What does the clause PRIMARY KEY followed by a field name in parentheses mean in a
CREATE TABLE
statement? Correct Answer: The column, in parentheses, is the primary key for the table.

Which statement should be used so that it assigns a foreign key to the customer name? Correct
Answer: FOREIGN KEY ( customer_name ) REFERENCES table_name ( customer_name

, )

Which ALTER TABLE statement adds a foreign key constraint to a child table? Correct Answer:
ALTER TABLE child
ADD FOREIGN KEY (par_id) REFERENCES parent (par_id) ON DELETE
CASCADE;

The database administrator has been tasked with implementing an index to speed up the retrieval
of
data based on the city values. The database is using the InnoDB engine.
What is the correct syntax to create an index to be built on the city field based on the database
information? Correct Answer: ALTER TABLE `Salesperson` ADD INDEX 'city_index' (`city`)

What is the name of the special internal database where the query optimizer finds information?
Correct Answer: Relational catalog

Which clause in a CREATE TABLE statement creates an index on a field? Correct Answer:
INDEX index_name (index_columns)

A database administrator needs to modify an index on the CUSTOMER table called
IDX_NAME because
there are multiple customers with the same name. It has been determined that it would be
desirable to
modify the index to also include the telephone number.
Which command line will modify the IDX_NAME index on the CUSTOMER table to include
both NAME
and TELEPHONE as part of the index? Correct Answer: ALTER INDEX IDX_NAME ON
CUSTOMER(NAME, TELEPHONE);

Which syntax is the correct way to use the DROP INDEX command to drop a primary key from
a table? Correct Answer: DROP INDEX `PRIMARY` ON tbl_name ;

A database administrator tries to delete a row in a parent table, but the delete fails because a row
in another table depends on that row.
Which referential-integrity rule is in effect? Correct Answer: The restrict delete rule

A manager deletes the BUILDING_MANAGEMENT row in a DEPARTMENT table. Deleting
the row also
deletes the GARDENING_TEAM and CLEANING_TEAM rows from the referenced
PERSONNEL_TEAMS table.
Which referential-integrity rule is in effect? Correct Answer: The cascade delete rule

INSERT INTO student VALUES('John','S',NULL),('Mary','S',NULL);
What do the parentheses denote? Correct Answer: The column values for two individual rows