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我試圖更新特定的列,通過採取column_1
值的行平均值,其中column_3 =
值MySQL不觸發
,但它給出了一個錯誤column_2
更新同桌不同列的AVG函數
我的代碼
Error: Can't update table 'moving_average' in stored function/trigger because it is already used by statement which invoked this stored function/trigger.
delimiter $$
Create TRIGGER takeaverage AFTER insert ON moving_table
FOR EACH ROW
BEGIN
update moving_table b, (select avg(price) avg_ from moving_table) v
set
b.moving_avg = v.avg_price;
END;
感謝您的回覆,你可以給我一個具體的查詢爲例 – Shaik