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Date: Tue, 27 Apr 2010 10:48:33 -0400 (EDT)
From: "Knut Anders Hatlen (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-4401) Document USING clause in joins
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    [ https://issues.apache.org/jira/browse/DERBY-4401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861415#action_12861415 ] 

Knut Anders Hatlen commented on DERBY-4401:
-------------------------------------------

The last cosmetic fix was committed to trunk right after the 10.6 branch was created. I have now merged it to the 10.6 branch and committed revision 938479.

> Document USING clause in joins
> ------------------------------
>
>                 Key: DERBY-4401
>                 URL: https://issues.apache.org/jira/browse/DERBY-4401
>             Project: Derby
>          Issue Type: Improvement
>          Components: Documentation
>    Affects Versions: 10.6.1.0
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>            Priority: Minor
>             Fix For: 10.6.1.0
>
>         Attachments: inner_syntax.diff, using.diff, using.zip
>
>
> DERBY-4370 made some of the join operations accept a USING clause. This should be documented in the reference manual.
> The JOIN operations section talks about "join clause", which should be fine since that could mean both ON clause and USING clause.
> The sections INNER JOIN operation, LEFT OUTER JOIN operation and RIGHT OUTER JOIN operation need to be updated with the new syntax. We need to replace
> {
>     ON booleanExpression
> }
> with
> {
>     { ON booleanExpression } |
>     { USING ( Simple-column-Name [ , Simple-column-Name ]* ) }
> }
> Perhaps it would make sense to factor out this part of the syntax into a separate element JoinSpecification, and explain the meaning of USING there.

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