drop table PAY_PERIODS;
create table PAY_PERIODS(
first_check   date,
second_check  date
);

insert into PAY_PERIODS(first_check,second_check) 
values ('14-JAN-00','28-JAN-00');
insert into PAY_PERIODS(first_check,second_check) 
values ('16-FEB-00','29-FEB-00');
insert into PAY_PERIODS(first_check,second_check) 
values ('16-MAR-00','30-MAR-00');
insert into PAY_PERIODS(first_check,second_check) 
values ('14-APR-00','28-APR-00');
insert into PAY_PERIODS(first_check,second_check) 
values ('16-MAY-00','30-MAY-00');
insert into PAY_PERIODS(first_check,second_check) 
values ('16-JUN-00','30-JUN-00');
insert into PAY_PERIODS(first_check,second_check) 
values ('14-JUL-00','28-JUL-00');

insert into PAY_PERIODS(first_check,second_check) 
values ('16-AUG-00','30-AUG-00');
insert into PAY_PERIODS(first_check,second_check) 
values ('15-SEP-00','29-SEP-00');
insert into PAY_PERIODS(first_check,second_check) 
values ('16-OCT-00','30-OCT-00');
insert into PAY_PERIODS(first_check,second_check) 
values ('16-NOV-00','30-NOV-00');
insert into PAY_PERIODS(first_check,second_check) 
values ('15-DEC-00','29-DEC-00');