使用一个SQL查询

Question

我使用这些SQL查询来删除行，两个表从两个表中删除：

DELETE FROM AGENT WHERE ID = ? 

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

我感兴趣我可以以某种方式结合两个SQL查询到一个SQL查询？

Answer 1

像这样：

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

？根据docs，您不能同时从多个表中删除记录。作为一个解决方案，你可以写一个存储过程，会从多个表中删除记录，像这样：

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..这是相同的表？如果是的话：

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

随着不同势表：

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