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PostgreSQL subqueries explained with simple examples

PostgreSQL subqueries allow one SQL query to run inside another, making it possible to solve filtering, aggregation, comparison, and table based problems without writing separate queries. The lesson ...
Simon Fraser University

Using a Pass-Through Query in a Subquery

Note: This example uses a Version 6 view descriptor with the Pass-Through Facility to access DBMS data. Beginning in Version 7, you can associate a libref directly with your DBMS data and use the ...