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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