當我運行我的查詢時，聚合函數異常

Question

這是我以前的問題（Getting an exception with datetime diff）的擴展，但是這次我將我的totalbreaktime設置爲float，下面是我的新查詢。

MERGE Time_Tracker as target using (SELECT USERID, cast(DATEDIFF(second,starttime,endtime)/60.0 as numeric(36,2)) as ColumnWithBreaksCount FROM BreaksTable 
where CONVERT(Date, StartTime) = CONVERT(Date, GETDATE()) GROUP BY USERID) as source ON target.USERID = source.USERID 
WHEN MATCHED THEN UPDATE SET BREAKS = source.ColumnWithBreaksCount; 

這次當我運行這個查詢時，我得到了下面的異常。

Msg 8120, Level 16, State 1, Line 1 
Column 'BreaksTable.StartTime' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause. 
Msg 8120, Level 16, State 1, Line 1 
Column 'BreaksTable.EndTime' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause. 

問題：

1. 正如我前面的問題的討論，我想更新我的Time_tracker.breaks作爲基於日期breakstable.totalbreaktime的總和。
2. 當我運行查詢（前一個）時，它正在考慮所有數據而不是當前日期的數據。

而我的表格數據如下。

Time_Tracker

BreaksTable

請讓我知道我要去哪裏錯了，我怎麼能解決這個問題。

感謝

Answer 1

你有這樣的子查詢中查詢：

SELECT USERID, 
     cast(DATEDIFF(second, starttime, endtime)/60.0 as numeric(36,2)) as ColumnWithBreaksCount 
FROM BreaksTable 
WHERE CONVERT(Date, StartTime) = CONVERT(Date, GETDATE()) 
GROUP BY USERID; 

第二列是不是一個集合列，也不是在GROUP BY子句中的表達式中的列。因此錯誤。

我可以推測你真正想要的第二列SUM()：

MERGE Time_Tracker as target using 
     (SELECT USERID, 
       cast(SUM(DATEDIFF(second, starttime, endtime))/60.0 as numeric(36,2)) as ColumnWithBreaksCount 
     FROM BreaksTable 
     WHERE CONVERT(Date, StartTime) = CONVERT(Date, GETDATE()) 
     GROUP BY USERID 
    ) as source 
     ON target.USERID = source.USERID 
WHEN MATCHED THEN UPDATE SET BREAKS = source.ColumnWithBreaksCount;