Index joins and sorts too

sql

-- Common candidates
JOIN orders o ON o.user_id = u.id
ORDER BY created_at DESC

Explanation

Foreign keys, join keys, and frequent sort keys are common indexing targets.

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Same sheet · prioritizing Core concepts

Indexes trade storage and write cost for faster reads.

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Columns with many distinct values tend to benefit more.

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Every extra index must be maintained during inserts, updates, and deletes.

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Use column order that matches real filter patterns.

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Use this checklist before creating a new index.

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