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Know the top SQL Query interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Know the top SQL Query interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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Freshers / Beginner level questions & answers

Ques 7

What is a view in a database?

A view is a virtual table based on the result of a SELECT query, and it does not store the data itself.

Example:

CREATE VIEW view_name AS SELECT column1, column2 FROM table WHERE condition;
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Ques 9

Explain the purpose of the ORDER BY clause.

The ORDER BY clause is used to sort the result set of a query in ascending or descending order based on one or more columns.

Example:

SELECT column1, column2 FROM table ORDER BY column1 DESC;
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Ques 11

Explain the difference between CHAR and VARCHAR data types.

CHAR is a fixed-length string data type, while VARCHAR is a variable-length string data type. CHAR pads spaces to the maximum length, while VARCHAR only stores the actual data without padding.
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Ques 12

What is the purpose of the SQL DISTINCT keyword?

The DISTINCT keyword is used to return unique values in the result set of a SELECT query by eliminating duplicate rows.

Example:

SELECT DISTINCT column FROM table;
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Ques 13

What is the purpose of the SQL UPDATE statement?

The UPDATE statement is used to modify the existing records in a table by changing the values of one or more columns.

Example:

UPDATE table SET column1 = value1, column2 = value2 WHERE condition;
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Ques 14

What is the purpose of the SQL LIKE operator?

The LIKE operator is used to search for a specified pattern in a column. It is often used with wildcard characters (% and _).

Example:

SELECT * FROM table WHERE column LIKE 'pattern%';
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