When you want to compare two strings that may have case differences on a case-insensitive server, this script will quickly and easily do the compare for you. It returns 0 if strings are equal, 1 if not. Feel free to modify/reuse in your code.
/*
©Copyright 2003 Mike McManus (mmcmanus@cierant.com) All Rights Reserved
*/
/* --------------------- For case-sensitive compare of string values on case-insensitive SQL Server -------------------------- *//* --------------------------------- Will Return 0 if parms are equal, 1 if not ---------------------------------------------- */
Create Procedure CaseCompare @String1 Varchar(100),@String2 Varchar(100)
As
Declare
@Pos int,
@String1_Ascii int,
@String2_Ascii int,
@ReturnVal int,
@String1_len int,
@String2_len int
/* -------------------------------------------------- Initialize Vars ----------------------------------------------------------- */Set NOCOUNT On
Set @String1_Ascii = 0
Set @String2_Ascii = 0
Set @Pos = 1
Set @ReturnVal = 0
/* ------------------------------------------------------------------------------------------------------------------------------ */
If ((@String1 Is Null) Or (@String2 Is Null))
Begin
Select @ReturnVal = 1
End
Else
Begin
Select @String1_len = len(@String1), @String2_len = len(@String2)
If (@String1_len != @String2_len)
Begin
Select @ReturnVal = 1
End
Else
Begin
/* ------- Compare Strings one character at a time until finished, or until they don't match --------------------- */
While ((@Pos <= Datalength(@String1)) And (@ReturnVal = 0))
Begin
Select @String1_Ascii = ASCII(SubString(@String1, @Pos, 1)), @String2_Ascii = ASCII(SubString(@String2, @Pos, 1))
Select @ReturnVal = @ReturnVal + (@String1_Ascii - @String2_Ascii)
Set @Pos = @Pos + 1
End
End
End
/* --- To make sure we get a non-negative return value --- */
If (@ReturnVal != 0)
Begin
Set @ReturnVal = 1
End
/* ------------------------------------------------------- */
-- If testing, or running stand-alone, do Select. To execute from other stored proc or function, do Return.
-- Select @ReturnVal
Return @ReturnVal
go 
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