我有 3 张桌子:
event:
---------------------
event_id | uid | date
---------------------
event_invitees
----------------------
invitees_id | event_id
----------------------
notification
-----------------
uid | invitees_id
-----------------
我创建了一个触发器,它将在插入“event_invitees”后插入“通知”表
delimiter |
create trigger eventNotificationTrigger after insert on event_invitees
for each row
begin
declare id int(12);
set id = (select uid from event where event_id=new.event_id);
insert into notification (invitees_id,uid) select invitees_id,@id from event_invitees where event_id=new.event_id;
end;
|
但它无法从事件表中获取 uid。那么如何从不同的表中获取不同的值并将它们插入到触发器中的一个表中呢?