QUERY: SELECT count(*) FROM onek;count----- 1000(1 row)QUERY: SELECT count(*) AS random INTO RANDOM_TBL  FROM onek WHERE oidrand(onek.oid, 10);QUERY: INSERT INTO RANDOM_TBL (random)  SELECT count(*)  FROM onek WHERE oidrand(onek.oid, 10);QUERY: SELECT random, count(random) FROM RANDOM_TBL  GROUP BY random HAVING count(random) > 1;random|count------+-----(0 rows)QUERY: SELECT random FROM RANDOM_TBL  WHERE random NOT BETWEEN 80 AND 120;random------(0 rows)