Add CTEs documentation for PostgreSQL#4
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Added comprehensive guide on Common Table Expressions (CTEs) in PostgreSQL, covering syntax, benefits, and examples.
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| # Mastering PostgreSQL with Common Table Expressions (CTEs) | |||
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| If you find yourself writing long, nested subqueries that are difficult to read and debug, then **Common Table Expressions (CTEs)** are the feature you need. A CTE allows you to create a temporary, named result set that you can reference within a `SELECT`, `INSERT`, `UPDATE`, or `DELETE` statement. | |||
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Added comprehensive guide on Common Table Expressions (CTEs) in PostgreSQL, covering syntax, benefits, and examples.