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Advanced SQL Queries: Subqueries, Unions, and Window Functions
As you become more familiar with SQL, you may find that basic queries are not sufficient for complex data needs. Advanced SQL queries, including subqueries, unions, and window functions, provide powerful tools for sophisticated data analysis and manipulation. This guide explains these advanced SQL concepts with detailed examples.
Subqueries (inner or nested queries) are queries embedded within another query. They are often used for filtering, calculating aggregates, or testing data conditions.