的Mysql＃1235錯誤代碼，當創建2個觸發器不同用途

Question

我有在phpMyAdmin創建，就像一個觸發器：

BEGIN 
UPDATE bands SET 
bands.status = "active" 
where bands.id IN(
SELECT * FROM 
(select bands.id 
from bands where bands.id IN 
(select bandId from invites join bands 
on(invites.bandId = bands.id) 
where invites.status="approved" 
group by bandId having count(invites.status)=bands.total_personel))AS X); 
end 

該觸發器將改變我的樂隊爲活動狀態。

但是我想自動更改狀態爲「不活動」，如果它不符合where子句。

如果我創建另一個觸發條件：

BEGIN 
UPDATE bands SET 
bands.status = "inactive" 
where bands.id IN(
SELECT * FROM 
(select bands.id 
from bands where bands.id IN 
(select bandId from invites join bands 
on(invites.bandId < bands.id) 
where invites.status="approved" 
group by bandId having count(invites.status)=bands.total_personel))AS X); 
end 

MySQL允許我＃1235錯誤代碼。

我該如何解決這個問題？還是有辦法在一個觸發器中結合這些目的？

Answer 1

我找到了答案。我之前不知道UPDATE命令可以和WHEN條件結合使用。

下面的代碼：

BEGIN 
UPDATE bands SET status = CASE 
WHEN bands.id IN 
(SELECT * FROM 
(select bands.id from bands where bands.id IN 
(select bandId from invites join bands 
on(invites.bandId = bands.id) 
where invites.status="approved" 
group by bandId having count(invites.status)=bands.total_personel))AS X) 
then "active" 
ELSE "inactive" 
END 
WHERE bands.id in (select distinct invites.bandId from invites); 
END 

，MySQL的代碼更改狀態，以積極的，如果滿足條件時，並自動更改的狀態設置爲無效，如果它不符合WHEN條件。