DF089: The CASE expression with the ELSE clause that returns a NULL value is used.
Last modified: May 28, 2025
The topic describes the DF089 T-SQL code analysis rule.
Category
STYLE
Message
The CASE expression with the ELSE clause that returns a NULL value is used.
Description
It is not recommended to use the ELSE clause that returns a NULL value with CASE expressions because even without it, a CASE expression will result in returning NULL as the default value.
Noncompliant code example
SELECT
CASE
WHEN @id = 12 THEN 'YES'
ELSE NULL
END
Compliant solution
SELECT
CASE
WHEN @id = 12 THEN 'YES'
END
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