SQL Case Statement/Expression with Examples | WHEN THEN ELSE in sql | Part 18

Published: 28 August 2023
on channel: Tech with Developer

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SQL Case Statement/Expression with Examples | WHEN THEN ELSE in sql | Part 18

the CASE statement (sometimes referred to as a CASE expression) is a powerful tool for performing conditional logic within queries. It allows you to create conditional branches and return different values based on the evaluation of specified conditions. The basic syntax of the CASE statement is as follows:

CASE
WHEN condition1 THEN result1
WHEN condition2 THEN result2
...
ELSE else_result
END

Here's a breakdown of the components:

CASE: The beginning of the CASE statement.
WHEN condition THEN result: This part checks if the given condition is true. If it's true, the corresponding result is returned.
ELSE else_result: If none of the conditions are true, this value will be returned.
END: The end of the CASE statement.
You can also use a "simple" version of the CASE statement when you are only evaluating a single expression against multiple possible values. Here's the syntax:

CASE expression
WHEN value1 THEN result1
WHEN value2 THEN result2
...
ELSE else_result
END

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