> For the complete documentation index, see [llms.txt](https://nightly.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nightly.gitbook.io/docs/database/clickhouse-problems.md).

# Clickhouse Problems

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[Recommendation system](/docs/database/clickhouse-problems/systeme-de-recommandation.md)
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[STRING Deep Search](/docs/database/clickhouse-problems/string-deep-search.md)
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