update条件判断更新

UPDATE cw_party tp,
cw_shop ts
SET tp.state = 3,
ts.bonus_average = CASE
WHEN ts.bonus_average > 0 THEN
(50 + ts.bonus_average) / 2
ELSE
50
END,
tp.update_time = 1510629839,
ts.update_time = 1510629839
WHERE
tp.id = 470
AND ts.id = 49