SQL 2008 CASE statement aggravation...

Posted by Brad on Stack Overflow See other posts from Stack Overflow or by Brad
Published on 2010-05-07T17:34:37Z Indexed on 2010/05/07 17:38 UTC
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Why does this fail:

DECLARE @DATE VARCHAR(50) = 'dasf'
SELECT CASE WHEN ISDATE(@DATE) = 1 THEN CONVERT(date,@DATE) ELSE @DATE END

Msg 241, Level 16, State 1, Line 2 Conversion failed when converting date and/or time from character string.

Why is it trying to convert dasf to date when it clearly causes ISDATE(@DATE) = 1 to evaluate to false...

If I do:

SELECT ISDATE(@DATE)

The return value is 0.

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