Explore topic-wise MCQs in Database.

This section includes 25 Mcqs, each offering curated multiple-choice questions to sharpen your Database knowledge and support exam preparation. Choose a topic below to get started.

1.

With the UNION clause, each query involved must output the same number of columns, and they must be UNION compatible.~!

A. True
B. False
Answer» B. False
Discussion
2.

A function returns one value and has only output parameters.~!

A. True
B. False
Answer» C.
Discussion
3.

A correlated subquery is where the outer query depends on data from the inner query.~!

A. True
B. False
Answer» C.
Discussion
4.

Outer join is the same as equi-join, except one of the duplicate columns is eliminated in the result table.~!

A. True
B. False
Answer» C.
Discussion
5.

The code to create triggers and routines is stored in only one location and is administered centrally.%!

A. True
B. False
Answer» B. False
Discussion
6.

The most frequently used relational operation, which brings together data from two or more related tables into one resultant table, is called an equi-join.%!

A. True
B. False
Answer» C.
Discussion
7.

Subqueries can be nested multiple times.%!

A. True
B. False
Answer» B. False
Discussion
8.

ROLLBACK WORK asks SQL to empty the log file.%!

A. True
B. False
Answer» B. False
Discussion
9.

There should be one condition within the WHERE clause for each pair of tables being joined.%!

A. True
B. False
Answer» B. False
Discussion
10.

The UNION clause is used to combine the output from multiple queries together into a single result table.%!

A. True
B. False
Answer» B. False
Discussion
11.

The joining technique is useful when data from several relations are to be retrieved and displayed and the relationships are not necessarily nested.%!

A. True
B. False
Answer» B. False
Discussion
12.

When AUTOCOMMIT is set on, changes will be made automatically at the end of each SQL statement.%!

A. True
B. False
Answer» B. False
Discussion
13.

Triggers are stored blocks of code that have to be called in order to operate.%!

A. True
B. False
Answer» C.
Discussion
14.

A transaction is the complete set of closely related update commands that must all be done, or none of them done, for the database to remain valid.%!

A. True
B. False
Answer» B. False
Discussion
15.

A UNION query is which of the following?%!

A. Combines the output from no more than two queries and must include the same number of columns.
B. Combines the output from no more than two queries and does not include the same number of columns.
C. Combines the output from multiple queries and must include the same number of columns.
D. Combines the output from multiple queries and does not include the same number of columns.
Answer» D. Combines the output from multiple queries and does not include the same number of columns.
Discussion
16.

Which of the following is true concerning triggers?%!

A. You do not create them with SQL.
B. They execute against only some applications that access a database.
C. They have an event, condition, and action.
D. They cannot cascade (cause another trigger to fire).
Answer» D. They cannot cascade (cause another trigger to fire).
Discussion
17.

*/*_Which of the following statements is true concerning routines and triggers??

A. Both consist of procedural code.
B. Both have to be called to operate.
C. Both run automatically.
D. Both are stored in the database.
Answer» B. Both have to be called to operate.
Discussion
18.

*/*_A UNION query is which of the following??

A. Combines the output from no more than two queries and must include the same number of columns.
B. Combines the output from no more than two queries and does not include the same number of columns.
C. Combines the output from multiple queries and must include the same number of columns.
D. Combines the output from multiple queries and does not include the same number of columns.
Answer» D. Combines the output from multiple queries and does not include the same number of columns.
Discussion
19.

*/*_Which of the following is true concerning triggers??

A. You do not create them with SQL.
B. They execute against only some applications that access a database.
C. They have an event, condition, and action.
D. They cannot cascade (cause another trigger to fire).
Answer» D. They cannot cascade (cause another trigger to fire).
Discussion
20.

_ A CASE SQL statement is which of the following?$?

A. A way to establish an IF-THEN-ELSE in SQL.
B. A way to establish a loop in SQL.
C. A way to establish a data definition in SQL.
D. All of the above.
Answer» B. A way to establish a loop in SQL.
Discussion
21.

_ Embedded SQL is which of the following?$?

A. Hard-coded SQL statements in a program language such as Java.
B. The process of making an application capable of generating specific SQL code on the fly.
C. Hard-coded SQL statements in a procedure.
D. Hard-coded SQL statements in a trigger.
Answer» B. The process of making an application capable of generating specific SQL code on the fly.
Discussion
22.

_ The following SQL is which type of join: SELECT CUSTOMER_T. CUSTOMER_ID, ORDER_T. CUSTOMER_ID, NAME, ORDER_ID FROM CUSTOMER_T,ORDER_T ;$?

A. Equi-join
B. Natural join
C. Outer join
D. Cartesian join
Answer» E.
Discussion
23.

_Which of the following is true concerning a procedure?$?

A. You do not create them with SQL.
B. They do not need to have a unique name.
C. They include procedural and SQL statements.
D. They are the same thing as a function.
Answer» D. They are the same thing as a function.
Discussion
24.

_The following SQL is which type of join: SELECT CUSTOMER_T. CUSTOMER_ID, ORDER_T. CUSTOMER_ID, NAME, ORDER_ID FROM CUSTOMER_T,ORDER_T WHERE CUSTOMER_T. CUSTOMER_ID = ORDER_T. CUSTOMER_ID$?

A. Equi-join
B. Natural join
C. Outer join
D. Cartesian join
Answer» B. Natural join
Discussion
25.

_How many tables may be included with a join?$?

A. One
B. Two
C. Three
D. All of the above.
Answer» E.
Discussion