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A comprehensive SQL guide covering the full spectrum from basic SELECT queries to advanced topics. Walks through database anatomy, filtering, aggregation, JOINs (INNER, LEFT, SELF), DML/DDL operations, subqueries, CTEs, window functions (RANK, LAG/LEAD), SQL logical execution order, and index performance tips. Uses PostgreSQL-friendly syntax throughout with practical examples and best-practice recommendations like avoiding SELECT *, using keyset pagination, and understanding NULL semantics.

SQL Crash Course: JOINs, CTEs, and Window Functions

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