问题
I have a bitmasked int field in my database. Usually I manage it through C# code, but now I need to flip a bit in the mask using T-SQL
How do I accomplish the following:
The bit I want to flip: 1 << 8 (256)
The mask value before I flip: 143
The mask value after I flip: 399
This can be done without the bit operators that's missing in T-SQL, right?
回答1:
Use XOR:
SELECT value ^ 256
So in your case, SELECT 143 ^ 256 will indeed return 399. If you want to pass in the exponent as well:
SELECT value ^ POWER(2, power)
回答2:
TSql Bitwise operators can be found here and good article on how to use them is here
来源：https://stackoverflow.com/questions/1110155/bit-flipping-operations-in-t-sql