UPDATE busi_chance_info t
SET t.exp_amount =
(SELECT floor(dbms_random.value(1, 10000000))
FROM busi_chance_info
WHERE busi_id = t.busi_id);
UPDATE busi_chance_info t
SET t.exp_amount =
(SELECT floor(dbms_random.value(1, 10000000))
FROM busi_chance_info
WHERE busi_id = t.busi_id);