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From "Matthias Ohlemeyer (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-883) Date functions are 'syntax error' in group by clause
Date Tue, 18 Apr 2006 09:26:19 GMT
    [ http://issues.apache.org/jira/browse/DERBY-883?page=comments#action_12374884 ] 

Matthias Ohlemeyer commented on DERBY-883:
------------------------------------------

If I read the documentation correctly (Reference Manual) then your SQL statement is simply
not allowed in Derby; it says

GROUP BY column-Name [ , column-Name ] *

where column-Name is a simple column name or a correlation; in my experiences correlations
only work when they refer to a simple column.

But IMO you are still right: Derby is missing an essential feature here; instead  of the above
something like 

GROUP BY SelectItem [ , SelectItem ] *

would be more in line with what other DBs have to offer; it should be possible to use arbitrary
select items from the SELECT clause in the GROUP BY clause. This "shortcoming" has made it
close to impossible to port a complex Oracle based application to Derby.

But since the documentation seems to be clear, I think this "bug" should be reclassified as
a "New Feature" or "Improvement"; for me the priority cannot be high enough, it is "Major"
at least and of course "Critical" for my application, but I'm not sure this can be generalized.

> Date functions are 'syntax error' in group by clause
> ----------------------------------------------------
>
>          Key: DERBY-883
>          URL: http://issues.apache.org/jira/browse/DERBY-883
>      Project: Derby
>         Type: Bug

>   Components: SQL
>     Versions: 10.1.2.1
>  Environment: JDK 1.5.0_05
>     Reporter: Lluis Turro

>
> This select would return an error syntax on finding "(" after month if group by clause:
> select idissue, month(creation), year(creation), count(distinct idissue)
> where 
>   ....
> group by idissue, month(creation), year(creation)

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