words=> select version(); version
---------------------------------------------------------------------------------------------------------- PostgreSQL 9.6.2 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-11), 64-bit (1 row) words=> select unnest(ARRAY['a','b','c','d','e','f']) order by random(); unnest -------- a b c d e f (6 rows)