Please any one tell meaning of this in sql server statement --- if ((@TablesToCheck & 1) <> 0)

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i not understand this procedure

SQL

ALTER PROCEDURE [dbo].aspnet_AnyDataInTables
    @TablesToCheck int
AS
BEGIN
   
    IF ((@TablesToCheck & 1) <> 0 AND

some code here

Posted 20-Feb-13 16:53pm

Pradip Jadhav, India

Updated 20-Feb-13 16:58pm

v6

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Abhinav S · Answer 1 · 2013-02-20T17:22:00

Solution 1

The code is checking if a boolean add with the parameter provided i.e. @TablesToCheck is not equal to 0.
If the table count is an integer, then perhaps the and is not required.

& is a bitwise And[^].

Posted 20-Feb-13 17:22pm

Abhinav S

Comments

Pradip Jadhav, India 20-Feb-13 23:24pm

hi i not understand boolean add if i using value for @tablestoCHeck is 16

maxrockM · Answer 2 · 2013-02-20T17:31:00

Solution 2

The code is doing a bitwise AND operation on the integer input.

So If @TablesToCheck is an even number it is returning 0 when you do

@TablesToCheck & 1

and returning 1 if @TablesToCheck is odd.

so @TablesToCheck = 2,4,6 etc returns 0 and @TablesToCheck = 1,3,5 etc returning 1.

Not sure why this is done though.

Posted 20-Feb-13 17:31pm

maxrockM

Comments

Pradip Jadhav, India 20-Feb-13 23:35pm

what is use of this in Procedure?

maxrockM 21-Feb-13 1:27am

Please post the entire procedure

Aarti Meswania · Answer 3 · 2013-02-20T18:04:00

Solution 3

it means if @TablesToCheck is even number (1,3,5,7,9,11,...) then execute statements written in IF condition.

It is similar like modulo by 2

SQL

IF ((@TablesToCheck % 2) <> 0

Happy Coding!
:)

Posted 20-Feb-13 18:04pm

Aarti Meswania

Comments

Pradip Jadhav, India 21-Feb-13 0:36am

hi but if (@TablesToCheck & 16) <> 0 then

Aarti Meswania 21-Feb-13 0:54am

you have used @TablesToCheck & 1 That is logic for checking even nos.

what you exactly want to do?

Aarti Meswania 21-Feb-13 0:58am

if (@TablesToCheck & 16) <> 0 then

it will go inside if statement block when @TablesToCheck is 16,144,304... etc

developer.redtray01 · Answer 4 · 2013-02-24T17:04:00

The code is doing a bitwise AND operation on the integer input.

So If @TablesToCheck is an even number it is returning 0 when you do
Collapse | Copy Code
@TablesToCheck & 1
and returning 1 if @TablesToCheck is odd.

so @TablesToCheck = 2,4,6 etc returns 0 and @TablesToCheck = 1,3,5 etc returning 1.

Not sure why this is done though.