通過在MsSQL查詢中使用某些操作來面對問題

Question

我是Mssql服務器的新手，我正在嘗試將Mysql查詢遷移到Mssql，因為該查詢面臨問題。

查詢是：

SELECT  converT(datetime,SWITCHOFFSET(converT(datetimeoffset,created), 'America/New_York')),  
        SUM(case when channel='FACEBOOK' then 1 else 0 end) AS  Messenger,
        SUM(case when channel='EMAIL' then 1 else 0 end) AS  Email,  
        SUM(case when channel='ECHO' then 1 else 0 end) AS Echo  
FROM   Conversation  
WHERE tenant_id=2 AND createdBy_id in(3) 
AND   created >= '2018-11-01 06:00:01'  
GROUP BY year(created), month(created),  DATEPART(week,created),day(created) 
ORDER BY created ASC;

我面臨的錯誤是：

列Conversation.created在選擇列表中無效，因為它既不包含在聚合函數中，也不包含在GROUP BY子句中。

當我嘗試在沒有聚合函數的情況下執行查詢時， converT和sum的組合不起作用。 誰能幫我這個忙。

提前致謝

Answer 1

有必要添加此converT(datetime,SWITCHOFFSET(converT(datetimeoffset,created)在Group By ，你已經分組等領域，並要顯示這樣的結果在Group By ：

SELECT  
    converT(datetime,SWITCHOFFSET(converT(datetimeoffset,created), 'America/New_York')),  
    SUM(case when channel='FACEBOOK' then 1 else 0 end) AS  Messenger,
    SUM(case when channel='EMAIL' then 1 else 0 end) AS  Email,  
    SUM(case when channel='ECHO' then 1 else 0 end) AS Echo  
FROM   Conversation  
WHERE tenant_id=2 AND createdBy_id in(3) 
AND   created >= '2018-11-01 06:00:01'  
GROUP BY converT(datetime,SWITCHOFFSET(converT(datetimeoffset,created), year(created), 
    month(created),  DATEPART(week,created),day(created) 
ORDER BY created ASC;

該錯誤意味着您擁有channel字段的SUM -一行，但是SQL Server也有很多行具有created列，並且它不知道應該選擇哪一行。