通过在MsSQL查询中使用某些操作来面对问题

Question

i am new to Mssql server i am trying to migrate Mysql queries to Mssql on the process facing issue with this query.

query is:

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;

And the error which i am facing is:

Column Conversation.created is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

When I am trying to execute to the query without aggregate function its working the combination of converT and sum is not working. Can anybody help me out this.

Thanks in advance

Answer 1

It is necessary to add this converT(datetime,SWITCHOFFSET(converT(datetimeoffset,created) in Group By as you already grouped other fields and you want to show this result in 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;

This error means that you've got SUM of channel field - one row, but SQL Server has also many rows with created column and it does not know what row should be chosen.