Syntax:
expr BETWEEN min AND max

If expr is greater than or equal to min and expr is less than or equal
to max, BETWEEN returns 1, otherwise it returns 0. This is equivalent
to the expression (min <= expr AND expr <= max) if all the arguments
are of the same type. Otherwise type conversion takes place according
to the rules described in
http://dev.mysql.com/doc/refman/5.1/en/type-conversion.html, but
applied to all the three arguments.

URL: http://dev.mysql.com/doc/refman/5.1/en/comparison-operators.html

