SELECT DISTINCT ON Tutorial with Examples

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Master SELECT DISTINCT ON in PostgreSQL to group and filter results efficiently—but beware of its quirks and order-sensitivity.

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Description
⚠️ SELECT DISTINCT ON in PostgreSQL — Powerful, but Handle with Care!
In this focused tutorial, we dive deep into a unique PostgreSQL feature — SELECT DISTINCT ON. Unlike the regular DISTINCT, this version lets you return one row per group, making it perfect for top-N queries, de-duplication, and custom row selection based on sorting.

But here's the catch — the order of your ORDER BY clause directly affects which rows are returned, and this can lead to unexpected results if you're not careful.

???? What You'll Learn:
✅ What DISTINCT ON is and how it differs from DISTINCT
✅ Real PostgreSQL examples using employee data
✅ How to choose one row per group with custom sorting
✅ Why ORDER BY is crucial with DISTINCT ON
✅ Best practices and common pitfalls to avoid

???? If you're building reports, leaderboards, or pulling recent entries from grouped data — this tool can save you time and complexity.

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