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database•Jan 13, 2026
Mastering SQL Aggregations: GROUP BY, HAVING, MIN, MAX, AVG
This post documents the author's process of learning SQL aggregations, from struggling with GROUP BY and HAVING to finally understanding the concepts and applying them to real-world questions.
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Original source
Key summary
A beginner's journey to understanding SQL aggregations, including GROUP BY, HAVING, and basic aggregate functions like MIN, MAX, and AVG.
TL;DR
- GROUP BY changes the game by thinking about groups of rows, not individual rows.
- A column must appear in the GROUP BY clause or be used in an aggregate function.
- WHERE filters rows before grouping, while HAVING filters groups after grouping.
- Understanding the order of execution of SQL queries clarifies the purpose of HAVING.
- GROUP BY and HAVING require a mental shift, not just syntax knowledge.
- Learning SQL aggregations takes time and practice, but it's a crucial step in becoming proficient in SQL.
This content is automatically summarized using AI. For full context, always refer to the original article.
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