I have a new article on my blog concerning using subqueries to improve performance. Applicable to Db2 across all platforms.
https://www.db2expert.com/db2expert/db2-sql-and-application-perform...
https://www.db2expert.com/db2expert/db2-sql-and-application-perform...
Db2 SQL and Application Performance: Part 3, Using Subqueries to Reduce Calls to the Data Server
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