Why PostgreSQL?
PostgreSQL is the world's most advanced open-source relational database. It combines ACID compliance, full-text search, JSON support, and advanced indexing in a battle-tested package that scales from side projects to enterprise workloads used by Apple, Instagram, and Reddit.
Basic Queries
SELECT retrieves data. INSERT adds records. UPDATE modifies them. DELETE removes them. PostgreSQL extends standard SQL with powerful features: window functions, CTEs (Common Table Expressions), and JSONB for semi-structured data storage.
Indexes for Performance
Indexes are critical for query performance. B-tree indexes (the default) work well for equality and range queries. GIN indexes excel for full-text search and JSONB queries. The EXPLAIN ANALYZE command shows exactly how PostgreSQL executes a query.
Production Best Practices
Never run SELECT * in production — specify columns explicitly. Use connection pooling (PgBouncer) for high-traffic applications. Enable SSL for remote connections. Schedule regular VACUUM to reclaim space and update query statistics.
