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https://issues.apache.org/jira/browse/DERBY-147?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mike Matrigali updated DERBY-147:
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Fix Version/s: 10.2.3.0
Rick merged this into the 10.2 branch with change 448966, not sure what version
of 10.2 that was, so just marking it fixed in latest unreleased version of 10.2.
> ERROR 42X79 not consistant ? - same column name specified twice
> ---------------------------------------------------------------
>
> Key: DERBY-147
> URL: https://issues.apache.org/jira/browse/DERBY-147
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Reporter: Bernd Ruehlicke
> Assignee: Bryan Pendleton
> Fix For: 10.2.3.0, 10.3.1.4
>
> Attachments: derby-147-10.0.2.1.diff, derby-147.diff,
> patch_with_tests.diff
>
>
> This happens from JDBC or ij. Here the output form ij>
> ij version 10.0
> CONNECTION0* - jdbc:derby:phsDB
> * = current connection
> ij> select a1.XXX_foreign, a1.native, a1.kind, a1.XXX_foreign FROM
> slg_name_lookup a1 ORDER BY a1.XXX_foreign;
> ERROR 42X79: Column name 'XXX_FOREIGN' appears more than once in the result
> of the query expression.
> But when removing the ORDER BY and keeping the 2 same column names it works
> ij> select a1.XXX_foreign, a1.native, a1.kind, a1.XXX_foreign FROM
> slg_name_lookup a1;
> XXX_FOREIGN
> |NATIVE
> |KIND |XXX_FOREIGN
>
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> 0 rows selected
> ij>
> So - it seams to be OK to specify the same column twice - as long as you do
> not add the ORDER BY clause.
> I woul dof course like that the system allows this - but at leats it should
> be consistant and either allow both or none of the two queries above.
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