Articles by tag: database

How to Write a SQL Query: Tutorial with Examples

Learn how to write a SQL query with practical examples. Master SELECT, WHERE, JOIN, GROUP BY, and best practices for readable, efficient SQL. Start now.

SQL Trainer: Practice Queries for Developers

Master SQL on real tasks in an interactive trainer. Modules on online store and library with JOIN, aggregations. For middle/senior dev and analysts. Start practice without theory right now.

Multi-phase transactions: implementing fault-tolerant operations in DBMS

Practical guide to implementing multi-phase transactions with idempotent operations to ensure data integrity. Learn how to prevent losses during failures.