BITOR() — Returns the mask of bits set in either of two BIGINT values
BITOR( value, value )
The BITOR) function returns the mask of bits set in either of two BIGINT integers. In other words, it performs a bitwise OR operation on the two arguments. The result is returned as a new BIGINT value — the arguments to the function are not modified.
The left-most bit of an integer number is the sign bit, but has no special meaning for bitwise operations. However, The left-most bit set to 1 followed by all zeros is reserved as the NULL value. If you use a NULL value as an argument, you will receive a NULL response. But in all other circumstances (using non-NULL BIGINT arguments), the bitwise functions should never return a NULL result. Consequently any bitwise operation that would result in only the left-most bit being set, will generate an error at runtime.