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)

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