Blog
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SQL Joins Explained: INNER, LEFT, RIGHT, FULL, and CROSS
A visual and practical guide to SQL joins: INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL OUTER JOIN, and CROSS JOIN — with examples for each type.
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SQL Style Guide: Conventions Every Team Should Follow
A practical SQL style guide covering keyword casing, naming conventions, indentation, JOIN formatting, and CTE structure for consistent, readable queries.
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SQL EXPLAIN and Execution Plans: A Complete Guide
Learn to read SQL execution plans using EXPLAIN and EXPLAIN ANALYZE in PostgreSQL and MySQL. Identify seq scans, index scans, hash joins, and cost estimates.
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SQL Query Optimization: Practical Techniques That Actually Work
Speed up slow SQL queries using indexes, avoiding SELECT *, rewriting subqueries, analyzing execution plans, and common anti-patterns to eliminate.
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SQL vs NoSQL: How to Choose the Right Database
Compare SQL and NoSQL databases by data model, consistency, scalability, and use case. Learn when to use PostgreSQL, MongoDB, Redis, or Cassandra.
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How to Format SQL: Rules, Tools, and Style Guides
Format SQL queries consistently with online tools, SQLFluff, Prettier, and editor extensions. Covers keyword casing, indentation, and WHERE/JOIN formatting rules.