> For the complete documentation index, see [llms.txt](https://b-greve.gitbook.io/beginners-guide-to-clean-data/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://b-greve.gitbook.io/beginners-guide-to-clean-data/data-inconsistency.md).

# Data inconsistency

- [No single point of truth](https://b-greve.gitbook.io/beginners-guide-to-clean-data/data-inconsistency/untitled.md)
- [Non-matching aggregated data](https://b-greve.gitbook.io/beginners-guide-to-clean-data/data-inconsistency/non-matching-aggregated-data.md)
- [Internal inconsistency](https://b-greve.gitbook.io/beginners-guide-to-clean-data/data-inconsistency/internal-inconsistency.md)