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SELECT string_agg(concat(substring('ABCDEFGHIJKLMNOPQRSTUVWXYZ', ceil(random() * 26)::integer, 1), substring('abcdefghijklmnopqrstuvwxyz', ceil(random() * 26)::integer, 1), substring('0123456789', ceil(random() * 10)::integer, 1), substring('!#$%&()*+,-./:;<=>?@[]^', ceil(random() * 23)::integer, 1) ), '' ORDER BY RANDOM() ) FROM generate_series(1,8);