Question

我正在使用这些SQL查询从两个表中删除行：

DELETE FROM AGENT WHERE ID = ?

DELETE FROM AGENT WHERE AGENT_GROUP_ID = (SELECT ID FROM AGENT_GROUP WHERE NAME = ?)

我感兴趣的是，我能以某种方式将两个SQL查询合并到一个SQL查询中吗？

Answer 1

像这样：

DELETE FROM AGENT 
 WHERE ID = ?
    OR AGENT_GROUP_ID = (SELECT ID FROM AGENT_GROUP WHERE NAME = ?

根据docs，您无法同时删除多个表中的记录。作为一种解决方案，您可以编写一个存储过程来删除多个表中的记录，如下所示：

create procedure delete_from_multiple_tables (
  p_key1 number
, p_key2 varchar2
)
as
begin
  delete table1 where id = p_key1;
  delete table2 where group_id = p_key2;
end delete_from_multiple_tables;

Answer 2

是的你可以..这是同一张桌子？如果是的话：

DELETE FROM AGENT WHERE AGENT_GROUP_ID = (SELECT ID FROM AGENT_GROUP WHERE NAME = ?) Or ID = ?

使用不同的表：

DELETE AGENT, MYTABLE2  
FROM AGENT INNER JOIN MYTABLE2  
WHERE AGENT.id = ?  OR MYTABLE2.id = (Select ID from ...)

使用一个SQL查询从两个表中删除

2 个答案: