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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-4370) Implement JOIN ... USING syntax
Date Mon, 07 Sep 2009 09:55:58 GMT
Implement JOIN ... USING syntax

                 Key: DERBY-4370
                 URL: https://issues.apache.org/jira/browse/DERBY-4370
             Project: Derby
          Issue Type: Improvement
          Components: SQL
    Affects Versions:
            Reporter: Knut Anders Hatlen
            Priority: Minor

The SQL standard defines two ways to specify the join condition in an INNER JOIN or a (LEFT/RIGHT/FULL)
OUTER JOIN: with an ON clause or with a USING clause. Derby currently only accepts joins with
an ON clause. Internally, Derby has code that supports USING. This code should be enabled
to ease the migration to Derby. We must also verify that the implementation adheres to the
standard before we enable it.

Since USING is already a reserved keyword in Derby's parser, enabling the USING syntax should
not cause any compatibility issues for existing queries.

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