lib/SQL/Abstract.pm 
2228:The reverse operator C<-not_in> generates SQL C<NOT IN> and is used in
2232:(by default : C<1=0>). Similarly, C<< -not_in => [] >> generates
2257:Another pair of operators is C<-between> and C<-not_between>,
2263:           -not_between => ['2002-10-01', '2003-02-06']
2301:database you can use the C<-bool> and C<-not_bool> operators.