Show error when i execute the below query in Sqlserver

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My query as follows

select distinct avg(r.rate) As Rate,f.bfid as BFid
FROM bthfac AS f,batch b,facfeedback r where f.facid= '60,75,6'
and f.Bthid=b.Bthid and r.bfid = f.bfid and b.class= 'PST'
and year(b.examdate)= '2011' and month(b.examdate)= '10' Group By r.Bfid

When i execute the above query shows error as follows

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

what is the problem in my above sql query.

please help me.

Regards,
Narasiman P.

Posted 17-May-13 23:31pm

Member 8054539

Updated 17-May-13 23:40pm

Mohammed Hameed

v2

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Mohammed Hameed · Answer 1 · 2013-05-17T23:39:00

Basically, you are perfoming an average of all r.rate then in first place why you need BFid?

I think id its not required there and it should not be;

and also SQL will not allow it because its not consistent and cannot be achieved while you do Group by.

Therefore I would recommend you to understand what is Group by and how it works.

Some link for your reference: http://www.w3schools.com/sql/sql_groupby.asp[^]

Mirza Fareed Baig · Answer 2 · 2013-05-18T00:42:00

Solution 2

When u use aggregate functions u have top use group by so u have to mention

SQL

r.Rate

also in Group By Clause

Posted 18-May-13 0:42am

Mirza Fareed Baig

debkumar@codeproject · Answer 3 · 2013-05-18T03:41:00

When you are grouping by some column(s) value, then you may select only those column(s) in the SELECT statement. You can not SELECT any column(s) those are not in GROUP BY clause. In you statement, you are grouping by r.Bfid, but, selecting f.bfid. This is not allowed. Just think it yourself why non GROUP BY column(s) are not allowed in SELECT statement.

I have changed the query. Check this.

SQL

select distinct avg(r.rate) As Rate, r.Bfid as BFid
FROM bthfac AS f,batch b,facfeedback r where f.facid= '60,75,6'
and f.Bthid=b.Bthid and r.bfid = f.bfid and b.class= 'PST'
and year(b.examdate)= '2011' and month(b.examdate)= '10' Group By r.Bfid

Show error when i execute the below query in Sqlserver

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