Boolean 'NOT' in T-SQL not working on 'bit' datatype?

Question

Trying to perform a single boolean NOT operation, it appears that under MS SQL Server 2005, the following block does not work

DECLARE @MyBoolean bit;
SET @My         


        

Answer 1

To assign an inverted bit, you'll need to use the bitwise NOT operator. When using the bitwise NOT operator, '~', you have to make sure your column or variable is declared as a bit.

This won't give you zero:

Select ~1 

This will:

select ~convert(bit, 1)

So will this:

declare @t bit
set @t=1
select ~@t