Question : NEGATE BIT

Hi, i would like to uptade a bit value with it negate actual value, it would look something like this

UPDATE TableName
SET column = NOT column
WHERE some_expresion

But it fails...
I've also tried with ! operator but i fails too...
Some sugestion?

P.D: Sorry for my English

Answer : NEGATE BIT

BIT is not a logical data type so the NOT operator doesn't work. You might want to think of BIT as a one bit numeric type. Instead code:

UPDATE TableName
    SET column = CASE WHEN column=1 THEN 0 ELSE 1 END
    WHERE some_expression

If you're using SQL Server 2000, you can encapsulate the BIT negation in a UDF.  Here's the creation script:

CREATE FUNCTION dbo.udf_BitNotBIT (

        @BIT bit --
      )
    RETURNS bit -- 1 if @BIT is 0 and 0 if @BIT is 1
/*
* Reverses the value of a BIT. Sort of like a NOT, but T-SQL
* doesn't treat BIT as a logical so NOT doesn't work.
*
* Common Usage:
select dbo.udf_BitNotBIT(1, 2)
* Test:
PRINT 'Test 1    ' + CASE WHEN 0=dbo.udf_BitNotBIT (1)
                     THEN 'Worked' ELSE 'ERROR' END
*
* © Copyright 2002 Andrew Novick http://www.NovickSoftware.com
* You may use this function in any of your SQL Server databases
* including databases that you sell, so long as they contain
* other unrelated database objects. You may not publish this
* UDF either in print or electronically.
***************************************************************/

AS BEGIN

    RETURN CASE WHEN @BIT=1 THEN 0 ELSE 1 END

END
GO

GRANT  EXECUTE  ON [dbo].[udf_BitNotBIT]  TO PUBLIC GO
GO


Then the UPDATE would become:

UPDATE TableName
    SET column = dbo.udf_BitNotBIT (column)
    WHERE some_expression

There are more sample UDFs in the T-SQL UDF of the week newsletter archive at:
http://www.NovickSoftware.com/UDFofWeek/UDFofWeek.htm

Regards,
Andy