• Register
–1 vote
55 views

Problem :

I want to display the column B in my below mentioned SQL query, but when I try to add it to my query it gives me following error:

Column T2.M' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

 

My code:

SELECT L, COUNT(M) as T1, M 
FROM T2 
WHERE ID=1 
GROUP BY L 
6 5 3
7,540 points

1 Answer

0 votes

Solution :

This error is trying to tell you that SQL Server is unaware of which M to select from the group.

So either you want to select one specific value in that case you need to use the appropriate aggregate function. Or if you want to select every value as the new row.

Please consider following exaples:

Our Data:

ID  L   M

1   1  13

1   1  79

1   2  13

1   2  13

1   2  42

Our query:

SELECT L, COUNT(M) AS T1

FROM T2

GROUP BY L

will return:

L  T1

1  2

2  3

which is correct.

Now consider the following (incorrect) query, which will produce the following error:

SELECT L, COUNT(M) AS T1, M

FROM T2

GROUP BY L

And it is returned the data set illustrating the problem:

L T1  M

1  2   13? 79? Both 13 and 79 as separate rows? (13+79=92)? ...?

2  3   13? 42? ...?

But now the following two queries will make this clear and will not cause any error:

1.      Using an aggregate query

SELECT L, COUNT(M) AS T1, SUM(M) AS M

FROM T2

GROUP BY L

will return:

L  T1  M

1  2   92

2  3   68

2.      Adding the column to the GROUP BY list query

SELECT L, COUNT(M) AS T1, M

FROM T2

GROUP BY L, M

will return:

L  T1  M

1  1   13

1  1   79

2  2   13

2  1   42

I hope it clears your issues.

9 7 4
38,600 points

Related questions

0 votes
1 answer 67 views
67 views
Problem : I want to select a maximum avg for each cname in my table. SELECT cname, wmname, MAX(avg)  FROM makerar GROUP BY cname; But I will get the below error, ERROR:  column "makerar.wmname" must appear in the GROUP BY clause or be used in an   aggregate ... )  FROM makerar GROUP BY cname; How can I go about fixing above error? Note: This table is the VIEW created from the previous operation.
asked Jan 22 jwilliam 3.9k points
0 votes
1 answer 26 views
26 views
Problem : Currently I am using the MySQL 5.7.13 on the windows PC with the WAMP Server While executing below query I am facing following error SELECT * FROM `tbl_customer_pod_uploads` WHERE `load_id` = '78' AND `status` = ' ... column 'returntr_prod.tbl_customer_pod_uploads.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
asked Feb 18 mphil 2.3k points
0 votes
1 answer 34 views
34 views
Problem : I am currently using MySQL 5.7.13 on my windows PC with the WAMP Server I am facing following error while executing below the query. Error: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column ' ... functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by Does anybody have any solution for above error?
asked Nov 29, 2019 alecxe 7.5k points
0 votes
2 answers 136 views
136 views
Problem : I know that my query below causes the error - ORDER BY items must appear in the select list if SELECT DISTINCT is specified. SELECT DISTINCT mycity FROM Employees WHERE mycountry = N'USA' AND myregion = N'WA' ORDER BY mybirthdate; What is a reason for ... gives me some output, but not the error. Is it because SELECT DISTINCT mycity only gives the result set with cities and nothing else ?
asked Jan 17 jwilliam 3.9k points
0 votes
1 answer 155 views
155 views
Problem : My stored procedure giving me following error cannot perform an aggregate function on an expression containing an aggregate or a subquery.
asked Nov 15, 2019 peterlaw 6.9k points