In SQL, which operator is used to combine two conditions and returns true if both are true? MCQ with Answer and Explanation

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In SQL, which operator is used to combine two conditions and returns true if both are true?

A. XOR

B. NOT

C. OR

D. AND

Answer: Option D

Solution (By JKSSB Mock Tests)

The AND operator returns true only if both conditions are true.

This question belongs to: Computer Database Management System (DBMS)

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Question #1

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Which of the following is a valid SQL statement to add a new column to a table?

A. ALTER TABLE table_name ADD column_name datatype;

B. Both A and C

C. ADD COLUMN TO table_name column_name datatype;

D. ALTER TABLE table_name ADD COLUMN column_name datatype;

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Correct Answer: Option B

Explanation:
Both 'ADD column_name datatype' and 'ADD COLUMN column_name datatype' are valid syntax in some DBMS, but standard SQL uses 'ADD column_name datatype'. However, many DBMS support both.

This question belongs to: Computer Database Management System (DBMS)

Question #2

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What does the SQL command 'INSERT INTO' do?

A. Deletes rows

B. Adds a new row to a table

C. Updates existing rows

D. Creates a table

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Correct Answer: Option B

Explanation:
INSERT INTO is used to insert new records (rows) into a table.

This question belongs to: Computer Database Management System (DBMS)

Question #3

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Which of the following is a non-aggregate function in SQL?

A. AVG()

B. LENGTH()

C. SUM()

D. COUNT()

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Correct Answer: Option B

Explanation:
LENGTH() (or LEN()) is a string function that returns the length of a string, not an aggregate. SUM, COUNT, AVG are aggregates.

This question belongs to: Computer Database Management System (DBMS)

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