PostgreSQL

PostgreSQL queries, CTEs, window functions, arrays, JSONB, and performance—advanced SQL interviews.

459 problems in 9 categories

PostgreSQL — SELECT basics

PostgreSQL — WHERE & filtering

PostgreSQL — JOINs

PostgreSQL — Aggregates & GROUP BY

PostgreSQL — Subqueries & CTEs

PostgreSQL — Window functions

PostgreSQL — DDL & constraints

PostgreSQL — Indexes & EXPLAIN

PostgreSQL — JSONB queries

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