Question

我是Mssql服务器的新手，我正在尝试将Mysql查询迁移到Mssql上，因为该查询遇到了问题。

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：

在选择列表中，列Conversation.created无效，因为它没有包含在聚合函数或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的组合无法正常工作。有人可以帮我吗？

预先感谢

Answer 1

当您已经将其他字段分组并且要在converT(datetime,SWITCHOFFSET(converT(datetimeoffset,created)中显示此结果时，有必要在Group By中添加此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;

此错误表示您在SUM字段中有channel-一行，但是SQL Server 也有许多带有created列的行，并且它不知道应该选择哪一行。

通过在MsSQL查询中使用某些操作来面对问题

1 个答案: