[jira] [Commented] (DERBY-3155) Support for SQL:2003 MERGE statement

["Kim Haase (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-3155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13739905#comment-13739905 ] 

Kim Haase commented on DERBY-3155:
----------------------------------

The spec draft looks great to me from a doc perspective -- very clear.

One typo maybe -- in the second bullet item under "The following rules apply:", should "tableTable" be "targetTable"?
                
> 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
>              Labels: derby_triage10_10
>         Attachments: 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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