mysql 联表 更新

update t_time t1

set t1.Bks=

(select max(t2.EndTime) from t_diaoyonglian0703 t2

where t1.TraceID=t2.TraceID and t2.Site='bks')-

(select MIN(t2.BeginTime) from t_diaoyonglian0703 t2

where t1.TraceID=t2.TraceID and t2.Site='bks')

where t1.Date='0703'

运行下列sql更新查询即可实现提问中的需求:

update order,(select order_id,

sum(goods_num*goods_price) as m

from order_goods group by order_id) b

set order.goods_total=b.m

where order.order_id=b.order_id

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