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select string_agg(substring, '') from ( SELECT substring('ABCDEFGHIJKLMNOPQRSTUVWXYZ', ceil(random() * 26)::integer, 1) FROM generate_series(1,12) -- 12 capital letters union SELECT substring('abcdefghijklmnopqrstuvwxyz', ceil(random() * 26)::integer, 1) FROM generate_series(1,12) -- 12 low case letters union SELECT substring('0123456789', ceil(random() * 10)::integer, 1) FROM generate_series(1,6) -- 6 digits union SELECT substring('!#$%&()*+,-./:;<=>?@[]^', ceil(random() * 23)::integer, 1) FROM generate_series(1,2) -- 2 other chars ) seria;