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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4045) Subquery causes error: 'updateString' not allowed because the ResultSet is not an updatable ResultSet
Date Mon, 02 Feb 2009 16:33:59 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12669651#action_12669651
] 

Knut Anders Hatlen commented on DERBY-4045:
-------------------------------------------

The reference manual says that subqueries are not allowed in the FROM clause. http://db.apache.org/derby/docs/10.4/ref/rrefsqlj41360.html#rrefsqlj41360__sqlj15384

But the code doesn't allow subqueries in the WHERE clause either. See SelectNode.isUpdatableCursor()
which contains this code:

		if ((getWhereSubquerys() != null) &&
			(getWhereSubquerys().size() != 0))
		{
			if (SanityManager.DEBUG)
			SanityManager.DEBUG("DumpUpdateCheck","cursor select has subquery in WHERE clause");
			return false;
		}

I'm not sure if just removing this check would actually make the query work, though, or if
it would work for all queries with a subquery in the WHERE clause. Anyway, if we don't allow
subqueries in WHERE clauses, the documentation should say so.

> Subquery causes error: 'updateString' not allowed because the ResultSet is not an updatable
ResultSet
> -----------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-4045
>                 URL: https://issues.apache.org/jira/browse/DERBY-4045
>             Project: Derby
>          Issue Type: Bug
>            Reporter: John T. Dow
>
> Embedded Derby (don't know about client) demoted an updatable result set apparently due
to a nested query.
> select * from orders where (orders.recordno = (select max(orders.recordno) from orders))
> Fix if possible. 
> If it can't be fixed, the documentation should be changed.

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