> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-mintlify-fbfa8bee.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> Documentation for Index

# Functions Overview

| Page                                                                  | Description                                                                                            |
| --------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------ |
| [Regular Functions](/reference/functions/regular-functions/overview)  | Functions whose result for each row is independent of all other rows.                                  |
| [User Defined Functions](/reference/functions/regular-functions/udf)  | User-defined functions (UDFs) in ClickHouse.                                                           |
| [Aggregate Functions](/reference/functions/aggregate-functions/index) | Functions that  accumulate a set of values across rows.                                                |
| [Table Functions](/reference/functions/table-functions/index)         | Methods for constructing tables.                                                                       |
| [Window Functions](/reference/functions/window-functions/index)       | Functions which let you perform calculations across a set of rows that are related to the current row. |