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Posted to derby-dev@db.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2013/09/18 16:44:02 UTC
[jira] [Commented] (DERBY-3155) Support for SQL:2003 MERGE
statement
[ https://issues.apache.org/jira/browse/DERBY-3155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13770828#comment-13770828 ]
ASF subversion and git services commented on DERBY-3155:
--------------------------------------------------------
Commit 1524432 from [~rhillegas] in branch 'code/trunk'
[ https://svn.apache.org/r1524432 ]
DERBY-3155: Remove spurious comma from grammar production for multiple WHEN [NOT] MATCHED clauses in MERGE statement; tests ran cleanly on derby-3155-02-ag-fixParserWarning.diff.
> 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, 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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