I'd like to chime in and say that we run such SELECT COUNT(*) queries all the time in Derby and have never encountered a problem.
Don't think that "AS" aliasing is necessary.

From: Chris Wilson <chris@aptivate.org>
To: Derby Discussion <derby-user@db.apache.org>
Date: 01/21/2011 01:07 PM
Subject: Re: Issue with COUNT function


On Fri, 21 Jan 2011, NBW wrote:

> SELECT COUNT(*) FROM (SELECT file.md5, instCollection.collectionId FROM
> file, collection leafCollection, collection instCollection WHERE
> (file.status=1 OR file.status=2) and file.collectionId =
> leafCollection.collectionId AND leafCollection.instanceCollectionId =
> instCollection.collectionId GROUP BY file.md5, instCollection.collectionId)
> That query under Oracle works fine. Under Derby I get the following error:
> [42X01][30000] Syntax error: Encountered "<EOF>" at line 1, column 313.
> If I run the query without the SELECT COUNT(*) it will run fine in Derby
> too, but I am trying to get the count :-)
> I feel like I must be missing something obvious here. 

I think that every sub-SELECT must have a table alias in Derby, so add "AS
t" to the end of the query (after the closing parenthesis) and it might
work :)

Cheers, Chris.
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