如何在sql数据库中使用内连接解决删除问题？

Question

尝试删除记录时出现以下错误：

错误：“SPO”处或附近的语法错误 第1行：删除SPO，SP ^

这是我的代码：

DELETE SPO,SP 
FROM stock_pack_operation SPO  
INNER JOIN stock_picking SP ON sp.id = spo.picking_id  
WHERE sp.company_id = 1;

Answer 1

你不能加入Postgres的FROM的DELETE。

如果你想用stock_picking sp的company_id和1中的所有相应行删除stock_pack_operation中的所有行，你可以使用带有RETURNING子句的cte。

WITH cte
(
DELETE FROM stock_picking sp
       WHERE sp.company_id = 1
       RETURNING sp.id
)
DELETE FROM stock_pack_operation spo
       USING cte
       WHERE spo.picking_id = cte.id;

如果想删除stock_pack_operation中picking_id为id的stock_picking为1公司的所有行，你可以使用USING。

DELETE FROM stock_pack_operation spo
       USING stock_picking sp
       WHERE spo.picking_id = sp.id
             AND sp.company_id = 1;