what the means of select 123&789

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SQL-Server-2014

if i am doing

HTML

 Statement        Result
select 1&1          1
select 1&2          0
select 1&3          1
select 1&4          0
select 123&1        1
select 123&7        3
select 1234&789     16
select 789&1234     16
select 78&12346     10
select 12345&678    32

Means?? Please help me..!!

Posted 29-Mar-14 0:57am

OPees

Updated 29-Mar-14 1:01am

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Mehdi Gholam · Accepted Answer · 2014-03-29T01:02:00

Solution 1

& is the bit wise AND so 1&2 (decimal) == 01 and 10 (binary) = 0 etc.

Posted 29-Mar-14 1:02am

Mehdi Gholam

Comments

OPees 29-Mar-14 7:10am

Thank you :)

OriginalGriff · Accepted Answer · 2014-03-29T01:08:00

"&" is a binary AND operator: it combines bits in the operand, so if the bit is one in both operands, than the result is the same bit one - other wise it is zero.
So, for each bit:

Op1  &   Op2   Result
 0        0       0
 0        1       0
 1        0       0
 1        1       1

It's kind hard to see from your example what is going on, because all your numbers are in decimal - which doesn't relate "nicely" to the actual bits. But...if you translate them to binary values first it's more obvious:

Your command       Op1             Op2            Result
select 1&1          01              01               1
select 1&2          01              10               0
select 1&3          01              11               1
select 1&4         001             100               0
select 123&1   1111011         0000001               1
select 123&7   1111011         0000111              11
etc.