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Unexpected LIKE behavior

Posted by Dimitri Furman on 04/22/07 02:18

SQL Server 2000 SP4.

Running the script below prints 'Unexpected':

-----------------------------
DECLARE @String AS varchar(1)

SELECT @String = 'z'

IF @String LIKE '[' + CHAR(32) + '-' + CHAR(255) + ']'
PRINT 'Expected'
ELSE
PRINT 'Unexpected'
-----------------------------

If the @String variable is set to 'y' (or in fact any ANSI character other
than 'z'), the result is 'Expected'. The comparison also evaluates as
expected if CHAR(255) is replaced with CHAR(254). The server collation, if
that matters, is SQL_Latin1_General_CP1_CI_AS.

It would be helpful to find the explanatin of this behavior. Thanks.

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