-- rational_in() tests
select rational('1') AS one;
select rational('-1') AS minus_one;
select rational('0/0') AS undef;
select rational('0/1') AS zero;
select rational('0/2') AS zero;
select rational('1/0') AS undef;
select rational('1/2') AS half;
select rational('4/6') AS two_third;
select rational('-0/0') AS undef;
select rational('-0/1') AS zero;
select rational('-0/2') AS zero;
select rational('-1/0') AS undef;
select rational('-1/2') AS minus_half;
select rational('-4/6') AS minus_two_third;
-- arith tests
select rational('0/1') + rational('1/2') AS half;
select rational('1/2') + rational('1/2') AS one;
select rational('1/2') + rational('-1/2') AS zero;
select rational('-1/2') + rational('-1/2') AS minus_one_ERR;
select rational('1/2') - rational('-1/2') AS one;
select rational('1/2') - rational('1/2') AS zero;
select rational('2/1') - rational('-1/1') AS minus_one_ERR;
select rational('2/1') - rational('1/1') AS minus_three_ERR;
select rational('2/1') * rational('1/2') AS one;
select rational('-1/2') * rational('-1/2') AS one_fourth;
select rational('1/2') * rational('-1/2') AS minus_one_fourth;
select rational('-1/2') * rational('1/2') AS minus_one_fourth;
select rational('2/3') / rational('2/3') AS one;
select rational('2/3') / rational('-3/2') AS minus_four_nineths;
select rational('-2/3') / rational('3/2') AS minus_four_nineths;
-- comparisions tests
select rational('0/1') = rational('1/2') AS false;
select rational('-1/2') > rational('1/2') AS false;
select rational('0/0') != rational('0/1') AS true;