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