通过在MsSQL查询中使用某些操作来面对问题

Question

我是Mssql服务器的新手，我正在尝试将Mysql查询迁移到Mssql，因为该查询面临问题。

查询是：

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;

我面临的错误是：

列Conversation.created在选择列表中无效，因为它既不包含在聚合函数中，也不包含在GROUP BY子句中。

当我尝试在没有聚合函数的情况下执行查询时， converT和sum的组合不起作用。 谁能帮我这个忙。

提前致谢

Answer 1

有必要添加此converT(datetime,SWITCHOFFSET(converT(datetimeoffset,created)在Group By ，你已经分组等领域，并要显示这样的结果在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;

该错误意味着您拥有channel字段的SUM -一行，但是SQL Server也有很多行具有created列，并且它不知道应该选择哪一行。