Question

我需要使用其他表中的信息更新表。这是我的SQL查询：

UPDATE service a 
JOIN agency b USING (feed_id) 
SET end_date = (SELECT MIN(start_date)-1 
                FROM service c 
                JOIN agency d USING (feed_id) 
                WHERE b.feed_id = a.feed_+1 
                      AND b.agency_id = d.agency_id)

我需要在条件中使用代理商ID，因此唯一的方法是将两个表与代理商表联系起来。

Postgres回归：

ERROR:  syntax error at or near "JOIN"
LINE 1: UPDATE service a JOIN agency b USING (feed_id) SET end_date ...

任何提示？

Answer 1

试试这个：）

UPDATE service
SET end_date = (SELECT MIN(start_date)-1 
                FROM service c 
                JOIN agency d USING (feed_id) 
                WHERE b.feed_id = a.feed_+1 
                      AND b.agency_id = d.agency_id)
FROM service a
JOIN agency b USING (feed_id)

Answer 2

此查询有效：

UPDATE service a
SET end_date = (SELECT MIN(start_date)-1
            FROM service b
            JOIN agency c ON b.feed_id = c.feed_id
            JOIN agency d ON a.feed_id = d.feed_id 
            WHERE b.feed_id = a.feed_id+1 
            AND c.agency_id = d.agency_id
            )

Postgresql用连接更新表

2 个答案: