SQL practice problems and solutions from HackerRank.
Related Articles
Deepen your understanding with these curated continuations.
PostgreSQL 5 min read
PostgreSQL Performance Tuning: Query Plans & Connection Pooling
Practical PostgreSQL tuning guide: read EXPLAIN ANALYZE, fix slow queries, use PgBouncer for pooling, and optimize autovacuum for high-performance databases.
Rachel
Database 5 min read
Database Indexing: B-trees, Composite Indexes & Performance
Learn how database indexes work, from B-trees to partial indexes. Understand composite index order and how to use EXPLAIN ANALYZE for better performance.
Rachel
PostgreSQL 5 min read
PostgreSQL JSONB: Query Patterns & Performance Optimization
Master PostgreSQL JSONB โ operators, indexing, querying nested data, aggregation, and performance tuning. Real-world patterns for modern applications.
Rachel