Which MySQL data type to use for storing boolean values

Question

Since MySQL doesn\'t seem to have any \'boolean\' data type, which data type do you \'abuse\' for storing true/false information in MySQL?

Especially in the context

Answer 1

This question has been answered but I figured I'd throw in my $0.02. I often use a CHAR(0), where '' == true and NULL == false.

From mysql docs:

CHAR(0) is also quite nice when you need a column that can take only two values: A column that is defined as CHAR(0) NULL occupies only one bit and can take only the values NULL and '' (the empty string).