ClickHouse/docs/en/agg_functions/index.md

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<a name="aggregate_functions"></a>
# Aggregate functions
Aggregate functions work in the [normal](http://www.sql-tutorial.com/sql-aggregate-functions-sql-tutorial) way as expected by database experts.
ClickHouse also supports:
- [Parametric aggregate functions](parametric_functions.md#aggregate_functions_parametric), which accept other parameters in addition to columns.
- [Combinators](combinators.md#aggregate_functions_combinators), which change the behavior of aggregate functions.
**Table of Contents**
```eval_rst
.. toctree::
reference
parametric_functions
combinators
```