列在HAVING子句中無效，因爲它不是在聚合函數或GROUP BY

Question

我試圖讓我的柱使用具有等於過濾器包含的，但問題是，它給出了這樣的錯誤消息：

column is invalid in the HAVING clause because it is not contained in either an aggregate function or the GROUP BY 

，當我嘗試添加過濾器的選擇和組由它說：

Column names in each view or function must be unique 

，因爲無論是列和過濾器是相同的：

列：

 userTable.userid 

過濾器：

user_filter.userid 

這裏是我的代碼：

SELECT DISTINCT 
userId, 
username, 
sum(userItem) 
from userTable inner join user_filter 
on userTable.userName = user_filter.userName 
group by userId, 
username, 
having userTable.userId = user_filter.userId 

Answer 1

你不需要Having條款添加另一過濾器Where條款

SELECT userid, 
     username, 
     Sum(useritem) 
FROM usertable 
     INNER JOIN user_filter 
       ON usertable.username = user_filter.username 
        AND usertable.userid = user_filter.userid 
GROUP BY userid, 
      username 

也是DISTINCT是多餘的，因爲Group by用於select