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Concepts Chapter 8 Subqueries
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Learning SQL, 2nd edition
www.r-5.orgChapter 7, Data Generation, Conversion, and Manipulation, demonstrates several built-in functions used for manipulating or converting data. Chapter 8, Grouping and Aggregates, shows how data can be aggregated. Chapter 9, Subqueries, introduces the subquery (a personal favorite) and shows how and where they can be utilized., ,
PostgreSQL - Tutorialspoint
www.tutorialspoint.comPostgreSQL i About the Tutorial PostgreSQL is a powerful, open source object-relational database system. It has more than 15 years of active development and a proven architecture that has earned it a strong