postgres=# postgres=# -- mod(x, y): Returns the remainder (modulus) when dividing x / y postgres=# SELECT mod(5, 5) AS no_remainder, postgres-# mod(6, 5) AS remainder_one, postgres-# mod(19, 5) AS remainder_four; no_remainder | remainder_one | remainder_four --------------+---------------+---------------- 0 | 1 | 4 (1 row) postgres=#