mysql執行SQL語句時，出現You can't specify target table '表名' for update in FROM clause錯誤

錯誤語句：

update tenant_menu set parent_id = (select id from tenant_menu where menu_code = '6') where menu_code = '6_7';

正確語句：

update tenant_menu set parent_id = (select a.id from (select tmp.* from tenant_menu tmp) a where menu_code = '6') where menu_code = '6_7';

錯誤原因不能將這張表數據查出來之後，而後又去更新這張表，只能先建個臨時表。