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Posted to derby-dev@db.apache.org by "Rick Hillegas (JIRA)" <ji...@apache.org> on 2014/05/29 18:37:01 UTC
[jira] [Updated] (DERBY-3155) Support for SQL:2003 MERGE statement
[ https://issues.apache.org/jira/browse/DERBY-3155?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Rick Hillegas updated DERBY-3155:
---------------------------------
Fix Version/s: 10.11.0.0
> 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
> Fix For: 10.11.0.0
>
> Attachments: MergeStatement.html, MergeStatement.html, MergeStatement.html, MergeStatement.html, MergeStatement.html, 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-3155-03-ag-backingStoreHashtableWithRowLocation.diff, derby-3155-03-ah-backingStoreHashtableWithRowLocation.diff, derby-3155-04-ae-deleteAction.diff, derby-3155-04-af-deleteAction.diff, derby-3155-05-aa-triggerTransitionTableAsTarget.diff, derby-3155-06-aa-triggerTransitionTableAsSource.diff, derby-3155-07-ad-insertAction.diff, derby-3155-08-ah-updateAction.diff, derby-3155-09-aa-correlationNames.diff, derby-3155-10-aa-correlationNames.diff, derby-3155-11-ab-beforeTriggersCantFireMerge.diff, derby-3155-12-aa-canOmitInsertColumnList.diff, derby-3155-13-aa-allowSystemAndTempTables.diff, derby-3155-14-aa-replaceCorrelationNamesOnLeftSideOfSETclauses.diff, derby-3155-15-aa-replumbMergeResultSetCleanup.diff, derby-3155-16-aa-treatCurrentRowLocationNodeLikeBaseColumnNode.diff, derby-3155-17-aa-serializingRowLocations.diff, derby-3155-18-aa-basicView.diff, derby-3155-19-aa-forbidSubqueriesInMatchedClauses.diff, derby-3155-20-aa-reworkColumnMatching.diff, derby-3155-21-ac-cleanupAndForbidSynonyms.diff, derby-3155-22-ad-testIdentifiersOnLeftSideOfSetClauses.diff, derby-3155-23-aa-forbidDerivedColumnLists.diff, derby-3155-24-aa-supportParameters.diff, derby-3155-25-aa-parametersAsInsertValues.diff, derby-3155-26-aa-copyRowLocationForIndexScans.diff, derby-3155-27-aa-adjustMatchingRefinements.diff, derby-3155-28-aa-cardinalityViolations.diff, derby-3155-29-aa-missingSchema.diff, derby-3155-30-ab-moreCorrelationNames.diff, derby-3155-31-aa-deletePrivs.diff, derby-3155-32-aa-newTestFunction.diff, derby-3155-33-ab-insertPrivs.diff, derby-3155-34-aa-updatePrivs.diff, derby-3155-34-ab-updatePrivs.diff, derby-3155-35-aa-allPrivsTest.diff, derby-3155-36-aa-lockModeComment.diff, derby-3155-37-aa-printSubNodes.diff, derby-3155-38-aa-datatypes.diff, derby-3155-39-aa-fixBuild.diff, derby-3155-40-aa-bigLobs.diff, derby-3155-41-aa-nullGeneratedColumns.diff, derby-3155-42-aa-triggersAndGeneratedColumns.diff, derby-3155-43-aa-eliminateDuplicateColumnRefs.diff, derby-3155-44-aa-lobsInTriggers.diff, derby-3155-45-aa-serialization.diff, derby-3155-46-aa-deferredDeletes.diff, derby-3155-47-aa-collations.diff, derby-3155-48-aa-indexScan.diff, derby-3155-49-aa-cleanup1.diff, derby-3155-50-aa-revampDeleteThenRows.diff, derby-3155-51-aa-cleanup2.diff, derby-3155-52-aa-upgrade.diff, derby-3155-53-aa-transitionSimpleColumn.diff
>
>
> 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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