Detecting if bit set in numeric value

Question

I have a tinyint column that represents a set of flags. Assuming I wanted to know if a specific bit was set or not, how can I do bitwise AND/OR in a stored procedure?

Answer 1

From your previous questions you use SQL Server. So you can use the & operator.

e.g. to see if the bit for 4 is on (and assuming NULL should return NULL)

SELECT CASE number & 4 WHEN 4 THEN 1 WHEN 0 THEN 0 END