In MySQL, sometime we may write
It means the LSB of `attrib` is 0.
However, it is different in C, because = have a higher precedence there, and we must use (attrib&1)==0 in C.
We'd better say, for those who is used to that [= have a higher precedence than & in C], it is more natural in MySQL and that bracket can be removed.
Precedence in C: http://www.difranco.net/cop2220/op-prec.htm
Precedence in MySQL: http://dev.mysql.com/doc/refman/4.1/en/operator-precedence.html