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https://issues.apache.org/jira/browse/DERBY-6983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16376777#comment-16376777
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Rick Hillegas commented on DERBY-6983:
--------------------------------------
Thanks for logging this bug, Lukas. It is the inner * which bothers Derby. The
following query also fails:
{noformat}
SELECT tablename
FROM sys.systables
WHERE tablename IN (
SELECT *
FROM (
SELECT 'SYSTABLES' t
FROM sysibm.sysdummy1
) t
)
;
{noformat}
The following workaround works for me:
{noformat}
SELECT *
FROM sys.systables
WHERE tablename IN (
SELECT t
FROM (
SELECT 'SYSTABLES' t
FROM sysibm.sysdummy1
) t
)
;
{noformat}
> Support SELECT * for IN predicate subqueries when it is "obvious" that the
> asterisk expands to exactly one column
> -----------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-6983
> URL: https://issues.apache.org/jira/browse/DERBY-6983
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.14.1.0
> Reporter: Lukas Eder
> Priority: Major
>
> The following query is not allowed in Derby:
> {code:java}
> SELECT *
> FROM sys.systables
> WHERE tablename IN (
> SELECT *
> FROM (
> SELECT 'SYSTABLES' t
> FROM sysibm.sysdummy1
> ) t
> ){code}
> The error I'm getting is:
> {code:java}
> 'SELECT *' only allowed in EXISTS and NOT EXISTS subqueries.{code}
> In this case, it is "obvious" that the asterisk (also a qualified asterisk:
> t.*) expands to exactly one column and the query should be perfectly fine.
> I'm not aware of any other databases with such a restriction.
>
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