Explore topic-wise MCQs in Rdbms.

This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Rdbms knowledge and support exam preparation. Choose a topic below to get started.

1.

SQL subqueries that can occur wherever a value is permitted provided the subquery gives only one tuple with a single attribute are called _________

A. Exact Subqueries
B. Vector Subqueries
C. Positive Subqueries
D. Scalar Subqueries
Answer» E.
Discussion
2.

Choose the correct option regarding the following query

A. The query is syntactically wrong
B. The query gives the studentID of the student with the maximum marks
C. The query gives the maximum marks amongst all the students
D. The query gives all the studentID values except the student with the maximum marksView Answer
Answer» C. The query gives the maximum marks amongst all the students
Discussion
3.

State true or false: We can use Subqueries inside the from clause

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

The _________ construct returns true if the argument in the sub-query is void of duplicates

A. not null
B. not unique
C. unique
D. null
Answer» D. null
Discussion
5.

What is a correlated sub-query?

A. An independent query that uses the correlation name of another independent query.
B. A sub-query that uses the correlation name of an outer query
C. A sub-query that substitutes the names of the outer query
D. A sub-query that does not depend on its outer query’s correlation names
Answer» C. A sub-query that substitutes the names of the outer query
Discussion
6.

The ________ comparison checker is used to check “each and every” condition

A. all
B. and
C. every
D. each
Answer» B. and
Discussion
7.

What is the result of the following query?

A. The query gives all the studnames for which marks are greater than all the students in section c
B. The query gives all the studnames for which the marks are greater than at least on student in section c
C. The query gives all the studnames for which the marks are less than all the students in section c
D. The query is syntactically incorrectView Answer
Answer» C. The query gives all the studnames for which the marks are less than all the students in section c
Discussion
8.

THE___________CONSTRUCT_RETURNS_TRUE_IF_THE_ARGUMENT_IN_THE_SUB-QUERY_IS_VOID_OF_DUPLICATES?$

A. not null
B. not unique
C. unique
D. null
Answer» B. not unique
Discussion
9.

State_true_or_false:_We_can_use_Subqueries_inside_the_from_clause$

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

The ______ construct returns true if a given tuple is present in the subquery.

A. not exists
B. present
C. not present
D. exists
Answer» C. not present
Discussion
11.

The ________ comparison checker is used to check “each and every” condition$

A. all
B. and
C. every
D. each
Answer» E.
Discussion
12.

The query gives all the studnames for which marks are greater than all the students in section c

A. The query gives all the studnames for which the marks are greater than at least on student in section c
B. The query gives all the studnames for which the marks are less than all the students in section c
C. The query is syntactically incorrect
Answer» B. The query gives all the studnames for which the marks are less than all the students in section c
Discussion
13.

State true or false : Nested Subqueries cannot be used for comparing two different sets

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

If a set is a collection of values given by the select clause, The ______ connective tests for set membership

A. within
B. include
C. under
D. in
Answer» E.
Discussion
15.

What is a subquery?

A. A subquery is a select-from-where expression that is nested within another query
B. A subquery is any query that is nested within another query
C. A subquery is a relation that is externally specified which can be used to handle data in queries
D. A subquery is a condition that excludes all the invalid tuples from the database
Answer» B. A subquery is any query that is nested within another query
Discussion