Chapter 5 (Final)

Question 1

The DROP command deletes rows from a table individually or in groups.

Answer 1

False

Question 2

If multiple Boolean operators are used in an SQL statement, NOT is evaluated first, then AND, then OR.

Answer 2

True

Question 3

What will be returned when the following SQL statement is executed?

SELECT driver_no,count(*) as num_deliveries
FROM deliveries
GROUP BY driver_no;

Answer 3

A listing of each driver as well as the number of deliveries that he or she has made

Question 4

Which of the following finds all groups meeting stated conditions?

Answer 4

HAVING

Question 5

To eliminate duplicate rows in a query, the ________ qualifier is used in the SQL Select command.

Answer 5

DISTINCT

Question 6

Given a table named store with 5 fields: store_id, address, city, state, zipcode, why would the following insert command not work?

INSERT INTO store values (‘234 Park Street’)

Answer 6

You must specify the fields to insert if you are only inserting some of the fields.

Question 7

What does the following SQL statement do?

SELECT * From Customer WHERE Cust_Type = “Best”

Answer 7

Selects all the fields from the Customer table for each row with a customer labeled “Best”

Question 8

Expressions are mathematical manipulations of data in a table that may be included as part of the SELECT statement.

Answer 8

True

Question 9

The FROM clause is the first statement processed in an SQL command.

Answer 9

True

Question 10

Adding the DISTINCT keyword to a query eliminates duplicates.

Answer 10

True

Question 11

The main concept of relational databases was published in 1970 by:

Answer 11

E.F.Codd.

Question 12

The DELETE TABLE DDL command is used to remove a table from the database.

Answer 12

False

Question 13

The views are created by executing a CREATE VIEW SQL command.

Answer 13

True

Question 14

Applications can be moved from one machine to another when each machine uses SQL.

Answer 14

True

Question 15

SQL originated from a project called System-S.

Answer 15

False

Question 16

The SQL command used to populate tables is the INSERT command.

Answer 16

True

Question 17

In an SQL statement, which of the following parts states the conditions for row selection?

Answer 17

WHERE

Question 18

The following query totals sales in state= ‘MA’ for each salesperson.

SELECT salesperson_id, sum(sales)
FROM salesperson
GROUP BY salesperson_id
HAVING state = ‘MA’;

Answer 18

False

Question 19

The WHERE clause is always processed before the GROUP BY clause when both occur in a SELECT statement.

Answer 19

True

Question 20

Which of the following counts ONLY rows that contain a value?

Answer 20

COUNT

Question 21

Relational databases are heavily based on the mathematical concept of:

Answer 21

set theory

Question 22

Which of the following is a purpose of the SQL standard?

Answer 22

To specify syntax and semantics of SQL data definition and manipulation languages

Question 23

A catalog is the structure that contains object descriptions created by a user.

Answer 23

False

Question 24

Implementation of a standard can never stifle creativity and innovation.

Answer 24

False

Question 25

SQL originated from a project called System-S.

Answer 25

False

Question 26

A single value returned from an SQL query that includes an aggregate function is called a(n):

Answer 26

scalar aggregate.

Question 27

An INSERT command does not need to have the fields listed.

Answer 27

True

Question 28

When creating a table, it is not important to consider foreign key–primary key mates.

Answer 28

False

Question 29

What does the following SQL statement do?

ALTER TABLE Customer_T
ADD (Type Varchar (2));

Answer 29

Alters the Customer_T table by adding a field called “Type”

Question 30

What result set is returned from the following query?

SELECT Customer_Name, telephone
FROM customers
WHERE city in (‘Boston’,’New York’,’Denver’);

Answer 30

The Customer_Name and telephone of all customers living in either Boston, New York or Denver

Question 31

What result set will the following query return?

SELECT Item_No, description
FROM item
WHERE weight > 100 and weight < 200;

Answer 31

The Item_No and description for all items weighing between 101 and 199

Question 32

Which of the following is true of the order in which SQL statements are evaluated?

Answer 32

The SELECT clause is processed before the ORDER BY clause.

Question 33

The following two SQL statements will produce different results.

SELECT last_name, first_name
FROM customer
WHERE state = ‘MA’ OR state = ‘NY’ OR state = ‘NJ’ OR state = ‘NH’ OR state = ‘CT’;

SELECT last_name, first_name
FROM customer
WHERE state in (‘MA’,’NY’,’NJ’,’NH’,’CT’);

Answer 33

False

Question 34

INSERT INTO is an example of ________ code.

Answer 34

DML

Question 35

Indexes are created in most RDBMSs to:

Answer 35

provide rapid random and sequential access to base-table data.

Question 36

________ is a set of commands used to update and query a database.

Answer 36

DML

Question 37

The following INSERT command would work fine:

INSERT INTO budget values 121,222,111;

Answer 37

False

Question 38

A database table is defined using the data definition language (DDL).

Answer 38

True

Question 39

A referential integrity constraint specifies that the existence of an attribute in one table depends upon the existence of a foreign key in the same or another table.

Answer 39

False

Question 40

If multiple Boolean operators are used in an SQL statement, NOT is evaluated first, then AND, then OR.

Answer 40

True