# User-Defined Aggregate Functions (UDAFs)

UDAFs support creation of custom aggregation logic, beyond the built-in aggregate functions supplied by SingleStore. See the [CREATE AGGREGATE](https://docs.singlestore.com/db/v9.1/reference/sql-reference/procedural-sql-reference/create-aggregate.md) topic for more information.

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Modified at: June 22, 2022

Source: [/db/v9.1/developer-resources/procedural-extensions/user-defined-aggregate-functions-udafs/](https://docs.singlestore.com/db/v9.1/developer-resources/procedural-extensions/user-defined-aggregate-functions-udafs/)

(An index of the documentation is available at /llms.txt)