# 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 ```