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SQL

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Intermediate9 hours

Learn how relational, NoSQL, vector, and cloud databases work — and how to pick, design, and query the right one for your application.

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Articles

Databases SQL Performance

Database Indexing Explained: B-Trees, Composite Indexes, and Query Optimization

A query that takes 4 seconds without an index takes 0.2ms with one. That's a 20,000x improvement from a single line of SQL. Indexes are the most impactful perfo…

Jul 4, 202614 min read

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SQL NoSQL Database

SQL vs NoSQL: A Developer's Comparison

SQL and NoSQL are not opposites — they solve different data problems. SQL databases store data in normalized tables with strict schemas, ACID transactions, and …

Jul 4, 202611 min read

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