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From "Mike Matrigali (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-3155) Support for SQL:2003 MERGE statement
Date Tue, 22 Oct 2013 17:01:48 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13802012#comment-13802012
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Mike Matrigali commented on DERBY-3155:
---------------------------------------

hi, I am reviewing in detail.  could you expand on the following:
4) Extra comments have been added. In particular, comments have been added to point out that
RowLocations are not currently supported for RowSource-based hash tables.

Is the plan to support this with future changes?  Or are RowSource-based hash tables always
indexes?  


> Support for SQL:2003 MERGE statement
> ------------------------------------
>
>                 Key: DERBY-3155
>                 URL: https://issues.apache.org/jira/browse/DERBY-3155
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Trejkaz
>            Assignee: Rick Hillegas
>              Labels: derby_triage10_10
>         Attachments: derby-3155-01-ac-grammar.diff, derby-3155-02-ag-fixParserWarning.diff,
derby-3155-03-ae-backingStoreHashtableWithRowLocation.diff, derby-3155-03-af-backingStoreHashtableWithRowLocation.diff,
derby-3155-04-ae-deleteAction.diff, MergeStatement.html, MergeStatement.html, MergeStatement.html
>
>
> A relatively common piece of logic in a database application is to check for a row's
existence and then either update or insert depending on its existence.
> SQL:2003 added a MERGE statement to perform this operation.  It looks like this:
>     MERGE INTO table_name USING table_name ON (condition)
>     WHEN MATCHED THEN UPDATE SET column1 = value1 [, column2 = value2 ...]
>     WHEN NOT MATCHED THEN INSERT column1 [, column2 ...] VALUES (value1 [, value2 ...])

> At the moment, the only workaround for this would be to write a stored procedure to do
the same operation, or to implement the logic client-side.



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