Query Rewriting: Subqueries, CTEs, Joins, Window Functions
Learn when to use subqueries vs joins vs CTEs, effective CTE patterns, IN vs EXISTS, OR to UNION rewrites, and avoiding SELECT *.
Posts tagged with #sql
Schema Design: Building the Foundation of Your Database
Learn how to design effective database schemas with proper data types, constraints, and relationships that scale with your application.
Isolation Levels: READ COMMITTED Through SERIALIZABLE
Understand READ COMMITTED, REPEATABLE READ, and SERIALIZABLE isolation levels, read vs write anomalies, and SET TRANSACTION syntax.
Database Design Roadmap: From Schema Basics to Distributed Data Architecture
A practical learning path covering relational modeling, NoSQL patterns, indexing strategies, query optimization, and distributed data systems — everything you need to design databases that actually hold up under production load.
Relational Databases: ACID Transactions and Data Foundation
Learn how relational databases work, from ACID properties and transactions to joins, indexing, and normalization in PostgreSQL and MySQL.