> For the complete documentation index, see [llms.txt](https://docs.collibra.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.collibra.com/data-quality-self-hosted/apis/using-notebooks-with-data-quality-observability-classic/rules-in-notebooks/sql-based-rules.md).

# SQL based rules

- [Simple rule](https://docs.collibra.com/data-quality-self-hosted/apis/using-notebooks-with-data-quality-observability-classic/rules-in-notebooks/sql-based-rules/simple-rule.md)
- [Freeform SQL](https://docs.collibra.com/data-quality-self-hosted/apis/using-notebooks-with-data-quality-observability-classic/rules-in-notebooks/sql-based-rules/freeform-sql.md)
- [Data type rules](https://docs.collibra.com/data-quality-self-hosted/apis/using-notebooks-with-data-quality-observability-classic/rules-in-notebooks/sql-based-rules/data-type-rules.md)
- [Outliers](https://docs.collibra.com/data-quality-self-hosted/apis/using-notebooks-with-data-quality-observability-classic/rules-in-notebooks/sql-based-rules/outliers.md)