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https://issues.apache.org/jira/browse/DERBY-4371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12858959#action_12858959
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C.S. Nirmal J. Fernando commented on DERBY-4371:
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Hi Bryan & Knut,
select a, sum(b) from t group by a having a+c > 1 : I checked this in both
Derby and PostgreSQL, this is not legal as Bryan correctly mentioned since
column reference 'c' included in having clause is not in group by clause,
though the 'a' in select clause is in the group by clause. (Note that 'b' is
used as 'sum(b)', i.e. if we use a column reference with an aggregate function
it need not to be in the group by clause.)
select a+c, sum(b) from t group by a+c having a+c > 1 :This is a valid query
in both Derby and PostgreSQL. I think Bryan is correct, since the same
expression used in *all 3* cases, this is successful. I verified this by
following queries:
select a, sum(b) from t group by a+c having a+c > 1 //this fails
select a-c, sum(b) from t group by a+c having a+c > 1 //this fails
select a-c, sum(b) from t group by a,c having a+c > 1 //this passes
select a, sum(b) from t group by a+c,a having a+c > 1 //this passes
---> this implies expressions in select clause should be
in group by clause
same way I figured out that an expression used in a having clause should be in
group by clause.
Thanks.
> Non-selected columns for SELECT DISTINCT allowed in ORDER BY clause if
> ordered by expression
> --------------------------------------------------------------------------------------------
>
> Key: DERBY-4371
> URL: https://issues.apache.org/jira/browse/DERBY-4371
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.5.1.1
> Reporter: Bernt M. Johnsen
> Assignee: C.S. Nirmal J. Fernando
> Priority: Critical
>
> How to repeat:
> ij> create table t (i integer, j integer);;
> 0 rows inserted/updated/deleted
> ij> insert into t values (1,2),(1,3);
> 2 rows inserted/updated/deleted
> ij> select distinct i from t order by j;
> ERROR 42879: The ORDER BY clause may not contain column 'J', since the query
> specifies DISTINCT and that column does not appear in the query result.
> ij> select distinct i from t order by j*2;
> I
> -----------
> 1
> 1
> 2 rows selected
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