Lightweight introduction to sparse primary indexes.

[tom-clickhouse]

Introduces ClickHouse’s sparse primary index and how it helps efficiently skip unnecessary data during query execution. Explains how the index is built and used, with examples and tools for observing its effect. Links to a deep dive for advanced use cases and best practices.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
clickhouse-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 10, 2025 9:11am

3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
clickhouse-docs-jp	⬜️ Ignored (Inspect)			Apr 10, 2025 9:11am
clickhouse-docs-ru	⬜️ Ignored (Inspect)	Visit Preview		Apr 10, 2025 9:11am
clickhouse-docs-zh	⬜️ Ignored (Inspect)	Visit Preview		Apr 10, 2025 9:11am

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

Tom Schreiber seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[Blargian]

@tom-clickhouse I think Dale prefers to have the responses without the line numbering. I'm fine to keep them as output_format_pretty_row_numbers is enabled by default. Defer to @gingerwizard.

Code blocks don't need runnable=true, runnable works as well.

[tom-clickhouse]

Line numbers in results help a lot with following explanations as I can refer to them like in Note how row 13 of the EXPLAIN output above shows that ...

[Blargian]

Line numbers in results help a lot with following explanations as I can refer to them like in Note how row 13 of the EXPLAIN output above shows that ...

Agree, in this case it is needed