---
title: Approximate Aggregate Overview
description: Analyze high-cardinality data at scale in OpenObserve with approximate aggregate SQL functions like approx_topk and approx_topk_distinct for top-k results.
---

OpenObserve provides the following approximate aggregate functions designed for high-cardinality data analysis at scale.

Learn more: 

- [approx_topk](approx-topk.md)
- [approx_topk_distinct](approx-topk-distinct.md)