IBM Db2 - The Ultimate Database for Cloud, Analytics & Mobile
Back in Version 9, Db2 for z/OS introduced minimal support for MERGE statementst, only providing an upsert capability with limited functionality. Db2 12 for z/OS enhances MERGE statements to be consistent with the SQL 2016 Core standard, as well as compatible with the Db2 family.
For the full story, see Enhanced SQL MERGE - a Db2 12 greatest hit with John Campbell.
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