Question

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?

Answer 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)