Postgres - 基于另一个表的 SQL 查询删除答案

【问题标题】：Postgres - SQL Query Delete based on another tablePostgres - 基于另一个表的 SQL 查询删除
【发布时间】：2018-03-10 05:12:00
【问题描述】：

我不知道如何将此查询转换为 DELETE 语句。

SELECT DISTINCT carts.id, shows.date from carts
INNER JOIN tickets on tickets.cart = carts.id
INNER JOIN actseats on actseats.ticket = tickets.id
INNER JOIN showacts on actseats.showact = showacts.id
INNER JOIN shows on shows.id = showacts.show
WHERE Shows.date >= '2017-05-05';

我从这个查询中得到的购物车是我要删除的。在删除语句中。

【问题讨论】：

三个供应商？...

标签： mysql sql-server postgresql

【解决方案1】：

WITH val AS (
SELECT DISTINCT carts.id cartid, shows.date from carts

INNER JOIN tickets on tickets.cart = carts.id

INNER JOIN actseats on actseats.ticket = tickets.id

INNER JOIN showacts on actseats.showact = showacts.id

INNER JOIN shows on shows.id = showacts.show

WHERE Shows.date >= '2017-05-05' )
DELETE FROM carts WHERE carts.id IN (SELECT cartid FROM val)

【讨论】：

假设这是因为使用从table 删除而不是从carts 删除而被否决。已更新。

【解决方案2】：

你可以试试

delete from carts where id in (SELECT DISTINCT carts.id from carts

INNER JOIN tickets on tickets.cart = carts.id

INNER JOIN actseats on actseats.ticket = tickets.id

INNER JOIN showacts on actseats.showact = showacts.id

INNER JOIN shows on shows.id = showacts.show

WHERE Shows.date >= '2017-05-05');

希望对你有所帮助。

【讨论】：