【錯誤內容】：Error Code: 1093. Table '表名' is specified twice, both as a target for 'UPDATE' and as a separate source for data

【錯產生經過】：update t_test1 set col1= col1_value where val1 in(select val1 from t_test2 group by val1);

【解決辦法】：update t_test1 set col1= col1_value where val1 in(select * from (select val1 from t_test2 group by val1) as T);

注意：經測試delete時，也存在這種情況