使用一個SQL查詢

Question

我使用這些SQL查詢來刪除行，兩個表從兩個表中刪除：

DELETE FROM AGENT WHERE ID = ? 

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

我感興趣我可以以某種方式結合兩個SQL查詢到一個SQL查詢？

Answer 1

像這樣：

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

？根據docs，您不能同時從多個表中刪除記錄。作爲一個解決方案，你可以寫一個存儲過程，會從多個表中刪除記錄，像這樣：

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..這是相同的表？如果是的話：

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

隨着不同勢表：

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