SQL Query Cheat Sheet

SQL Query Cheat Sheet is the quick reference for SQL queries across PostgreSQL, MySQL, and SQLite. No matter how experienced you are, there are always SQL syntax details you need to look up. This reference covers: - Basic SELECT statements and filtering - All JOIN types with visual diagrams: INNER, LEFT, RIGHT, FULL, CROSS - Aggregation functions and GROUP BY - Window functions: ROW_NUMBER, RANK, LAG, LEAD, SUM OVER - Common Table Expressions (CTEs) - Subqueries and correlated subqueries - String functions by database - Date and time functions - JSON operations in PostgreSQL - Index types and when to use them - EXPLAIN and query optimization - Transaction commands