How to do bitwise operation with TSQL.
I want to shift 1 bit towards left position. the extreme left bit should become extreme right bit as well.
Eg1:
Declare @a tinyint = 15
--Which is equal to 0000 1111
I need the result to be 30
--Which is equal to 0001 1110
Eg2:
Declare @a tinyint = 16
--Which is equal to 0001 0000
I need the result to be 32
--Which is equal to 0010 0000
Or selectively invert a bit. eg here invert 3rd bit position
input: 0011 0010
result: 0011 1010
For ease of understanding i showed the input in binary, actually the input must be an int type. Like 0001 0000 represents 16.
You can use ^
(exclusive or) to flip a bit. For example:
set @input = 15
set @bit = 4
set @result = @input ^ power(2, @bit - 1)
In a binary system, multiplying by two shifts all the bits one place to the left. So you can implement a 1-bit rotation by a shift and then manually carrying the top bit to the bottom bit:
set @input = 128
set @result =
case
when @input & 128 > 0 then (@input ^ 128) * 2 + 1
else @input * 2
end