Comments on: T-SQL Bitwise Operations

By: recep hazer

recep hazer — Tue, 15 Nov 2011 08:17:44 +0000

Here’s an interesting “bug” that I’ve found:

DECLARE @bitvar BIT
SET @bitvar = 6
PRINT @bitvar & 1
PRINT @bitvar & 2
PRINT @bitvar & 4
PRINT 6 & 1
PRINT 6 & 2
PRINT 6 & 4

@bitvar is bit how the hell it supposed to get value 6
try @bitvar as int there is no bug

By: Quotes

Quotes — Sat, 30 Apr 2011 03:31:20 +0000

Thanks for sharing this post.It is really worth reading.

By: Nabarupam Deb

Nabarupam Deb — Tue, 08 Mar 2011 12:57:30 +0000

What to do if the data is bigger than the BIGINT Range?

By: Paulo Pedro

Paulo Pedro — Sun, 01 Aug 2010 16:25:12 +0000

DECLARE @bitvar BIT
SET @bitvar = 6
PRINT @bitvar & 1
PRINT @bitvar & 2
PRINT @bitvar & 4
PRINT CAST(6 AS BIT) & 1
PRINT CAST(6 AS BIT) & 2
PRINT CAST(6 AS BIT) & 4

This is one of many situations where we should cast values first.

By: compact treadmill

compact treadmill — Thu, 04 Mar 2010 07:20:07 +0000

Helpful article and examples, Thanks.

By: Dave

Dave — Tue, 16 Feb 2010 14:31:44 +0000

You can also do the same trick without creating a lookup table variable, like this:

[code]
declare @tmp table
(
val int,
color nvarchar(100)
)

insert into @tmp (val, color) VALUES (0, 'black')
insert into @tmp (val, color) VALUES (1, 'red')
insert into @tmp (val, color) VALUES (2, 'yellow')
insert into @tmp (val, color) VALUES (4, 'blue')
insert into @tmp (val, color) VALUES (8, 'white')

declare @newval int
set @newval = 6

select
*
from
@tmp t cross join
(SELECT (@newval) as val) n
where
t.val & n.val 0
[/code]

By: Darren

Darren — Fri, 12 Feb 2010 13:55:31 +0000

Here’s an interesting “bug” that I’ve found:

DECLARE @bitvar BIT
SET @bitvar = 6
PRINT @bitvar & 1
PRINT @bitvar & 2
PRINT @bitvar & 4
PRINT 6 & 1
PRINT 6 & 2
PRINT 6 & 4

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By: Mike

Mike — Wed, 23 Dec 2009 18:55:42 +0000

This area of programming is becoming a lost art. Storing and retreiving data by using bit masks (as this article describes) is still a common use of bitwise operators, but there are so many other uses, namely data manipulation and calculation, that are becoming forgotton.

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