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rails•Jan 9, 2026
TIL: Blazing-fast correlated exists queries
Optimizing SQL queries with EXISTS: a clever technique to reduce redundancy and improve performance when checking for matching comments in a database.
devTo
Original source
Key summary
The author discusses a performance optimization technique using EXISTS in SQL queries to reduce redundancy when checking for matching comments in a database. This approach can be more efficient than using joins or subqueries, especially in situations with few posts and many comments.
TL;DR
- Use EXISTS to reduce redundancy in SQL queries
- Detecting one matching comment is sufficient for lookup results
- Avoid joining or subquerying all comments for a post
- Consider using EXISTS for performance optimization
- Postgres may optimize both approaches to a semi-join
- This technique is useful for systems with few posts and many comments
- See also a previous post on the power of EXISTS subqueries
This content is automatically summarized using AI. For full context, always refer to the original article.
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