我有两个表,我需要创建一个视图。这些表是:
credit_orders(id, client_id, number_of_credits, payment_status)
credit_usage(id, client_id, credits_used, date)
我使用以下查询来执行此操作。不带“创建视图”部分的查询效果很好,但带“创建视图”的查询则显示错误“视图的SELECT在FROM子句中包含子查询”。可能是什么问题和可能的解决方案:
create view view_credit_status as
(select credit_orders.client_id,
sum(credit_orders.number_of_credits) as purchased,
ifnull(t1.credits_used,0) as used
from credit_orders
left outer join (select * from (select credit_usage.client_id,
sum(credits_used) as credits_used
from credit_usage
group by credit_usage.client_id) as t0
) as t1 on t1.client_id = credit_orders.client_id
where credit_orders.payment_status='Paid'
group by credit_orders.client_id)
MySQL的
—
Matt Fenwick
@MattFenwick,不,不是-该查询可以轻松重写,这通常是不可能的
—
TMS