Add basic approx_count_distinct to docs

duckdb · Feb 13, 2025 · 559f9c3 · 559f9c3
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diff --git a/docs/functions.md b/docs/functions.md
@@ -20,6 +20,12 @@ Note: `ALTER EXTENSION pg_duckdb WITH SCHEMA schema` is not currently supported.
 
 All of the DuckDB [json functions and aggregates](https://duckdb.org/docs/data/json/json_functions.html). Postgres JSON/JSONB functions are not supported.
 
+## Aggregates
+
+|Name|Description|
+| :--- | :---------- |
+|[`approx_count_distinct`](https://duckdb.org/docs/sql/functions/aggregates.html#approximate-aggregates)|Gives the approximate count of distinct elements using HyperLogLog.|
+
 ## Cache Management Functions
 
 | Name | Description |