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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-4401) Document USING clause in joins
Date Thu, 08 Oct 2009 14:20:31 GMT
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: 10.6.0.0
            Reporter: Knut Anders Hatlen
            Priority: Minor


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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