C170 - Practice Test

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?

Which delete rule sets column values in a child table to a missing value when the matching data is deleted from the parent table?

Employee_ID Employee_Name Office_Address
12342 Jacob 54123 Main Street
12346 Michael 354 Center Avenue
12846 Ethan 54123 Main Street
12887 Joshua 54123 Main Street
12894 Daniel 354 Center Avenue
13097 Alexander 354 Center Avenue
13112 Anthony 54123 Main Street
13411 William 354 Center Avenue
13987 Christopher 354 Center Avenue
13998 Matthew 54123 Main Street
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?

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?

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?

Which command creates a database only if it does not already exist?

Refer to the given SQL statement.

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?

What does WHERE identify in a basic SQL SELECT statement?

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?

Refer to the given SQL statement.

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?

Which data definition language statement affects databases or objects in them?

What does the DELETE statement do?

Which condition must be in effect to use the INSERT INTO … VALUES syntax for an INSERT statement?

Refer to the given SQL statement.

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?

Refer to the given SQL statement.

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?

Which method creates an empty copy of a table and then populates it from the original table?

Which command eliminates a table?

Why is a view used to give controlled access to data?

A database manager plans to create a view of a table and has these two elements:

• The CREATE VIEW privilege for the table

• A level of privilege for every column selected by the SELECT
What else does the manager need to create this view?

Refer to the given SQL statement.

SELECT product_name, product_number, mfg_city FROM product;

Which statement, when added before this statement, generates a view?

What is the proper command to change a view?

Refer to the given statement.

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?

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?

Refer to the given information.

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?

What does the clause PRIMARY KEY followed by a field name in parentheses mean in a CREATE TABLE statement?

Which statement should be used so that it assigns a foreign key to the customer name?

Which ALTER TABLE statement adds a foreign key constraint to a child table?

Refer to the diagram of an index table.

Salesperson Table
Record
Address Salesperson
Number Salesperson
Name City
Hire Date
Commission
Rate
1 119 Taylor, A New York 1/21/01 20%
2 137 Baker, B Detroit 2/3/11 10%
3 186 Adams, A Dallas 8/23/96 5%
4 204 Dickens, S Dallas 8/4/12 5%
5 255 Lincoln, J Atlanta 6/7/13 5%
6 361 Carlyle, L Detroit 11/11/10 7%
7 420 Green, C Tucson 9/25/12 11%
8 452 French, F New York 10/23/09 8%
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?

What is the name of the special internal database where the query optimizer finds information?

Which clause in a CREATE TABLE statement creates an index on a field?

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?

Which syntax is the correct way to use the DROP INDEX command to drop a primary key from a table?

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?

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?

Refer to the given SQL statement.

INSERT INTO student VALUES('John','S',NULL),('Mary','S',NULL);

What do the parentheses denote?

What happens in an UPDATE statement if the WHERE clause is omitted?

Which action deletes all rows from a table?

What is the purpose of using a SELECT statement?

Which SQL statement retrieves all of the columns from the Owners table?

Which SQL statement tallies the number of different cities in which record companies have been founded?

Which task does ORDER BY perform by default?

A database administrator of a movie rental company needs to compile a list of movies released each year for a marketing campaign.

Which SQL command will accomplish this?

How does Table 2 affect the returned results from Table 1 in a left join?

Which command functions as a RIGHT JOIN with the roles of the tables reversed?

Refer to the given SQL statement.

SELECT t1.*, t2.* FROM t1 LEFT JOIN t2 ON t1.i1 = t2.i2

What does the LEFT JOIN statement do?

What is the difference between COUNT(*) and COUNT( col_name) for specified column names?

Which function determines the total value for a column?

How does a row subquery differ from a table subquery?

Refer to the given SQL statement.

1. SELECT SPNAME
2. FROM SALESPERSON
3. WHERE SPNUM=
4. FROM CUSTOMER
5. WHERE CUSTNUM=20900);

What is missing from the subquery at the beginning of line 4?