🗄️ SQL & Relational Databases

Write confident SQL for data analysis and backend development. Master JOINs, aggregations, subqueries, and window functions.

📚 42 lessons·⏱ 22 hours·Beginner

What you'll learn

✓Write confident SQL for data analysis and backend development

✓Master JOINs, aggregations, subqueries, and window functions

✓Understand indexing and query performance

✓Complete a cohort analysis project using real e-commerce data

SQLPostgreSQLMySQLJoinsIndexingBeginner

5 sections · 20 lessons · 22h

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SELECT, FROM, and WHERE

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ORDER BY, LIMIT, and OFFSET

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Aliasing columns and tables

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Filtering with BETWEEN, IN, and LIKE