C170 WGU QUESTIONS & ANSWERS
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? - Answer -Many-to-many
Which two examples are attributes? - 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? - 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? - 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? - 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? - 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? - 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? - Answer -WHERE PRODCOST=20;
What does WHERE identify in a basic SQL SELECT statement? - 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? - 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? - Answer -GROUP BY PRODNUM;
Which data definition language statement affects databases or objects in them? -
Answer -ALTER
What does the DELETE statement do? - Answer -It removes rows from a table.
Which condition must be in effect to use the INSERT INTO ... VALUES syntax for an
INSERT statement? - 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? - Answer -Decimal
Which two SQL data types can represent images or sounds? - 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? - Answer -CUSTOMER
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? - Answer -Many-to-many
Which two examples are attributes? - 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? - 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? - 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? - 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? - 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? - 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? - Answer -WHERE PRODCOST=20;
What does WHERE identify in a basic SQL SELECT statement? - 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? - 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? - Answer -GROUP BY PRODNUM;
Which data definition language statement affects databases or objects in them? -
Answer -ALTER
What does the DELETE statement do? - Answer -It removes rows from a table.
Which condition must be in effect to use the INSERT INTO ... VALUES syntax for an
INSERT statement? - 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? - Answer -Decimal
Which two SQL data types can represent images or sounds? - 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? - Answer -CUSTOMER
