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create table test ( "id" serial, "hash" varchar(64), "on" boolean ); insert into test values (1, 'aaa', true), (2, 'aaa', true), (3, 'bbb', true), (4, 'aaa', false), (5, 'ccc', true) ; select * from test join ( select "hash" from test where "on" is true order by random() limit 1 ) t on t.hash = test.hash;

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