Are there reasons for not storing boolean values in SQL as bit data types?

Question

Are there reasons for not storing boolean values in SQL as bit data types without NULL? I see them often stored as integers without constraints to limit values to 0 and 1,

Answer 1

BIT is the datatype normally used to store BOOLEAN values. Simply because if the BIT is 1 then its true and 0 then its false. It is that simple.