> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/server-usage/user-defined-functions/drop-function-udf.md).

# DROP FUNCTION UDF

## Syntax

```bnf
DROP FUNCTION [IF EXISTS] function_name
```

## Description

This statement drops the [user-defined function](/docs/server/server-usage/user-defined-functions.md) (UDF) named `function_name`.

To drop a function, you must have the [DELETE privilege](/docs/server/reference/sql-statements/account-management-sql-statements/grant.md) for the mysql database. This is because `DROP FUNCTION` removes the row from the [mysql.func](/docs/server/reference/system-tables/the-mysql-database-tables/mysql-func-table.md) system table that records the function's name, type and shared library name.

For dropping a stored function, see [DROP FUNCTION](/docs/server/server-usage/stored-routines/stored-functions/drop-function.md).

### Upgrading a UDF

To upgrade the UDF's shared library, first run a [DROP FUNCTION](/docs/server/server-usage/stored-routines/stored-functions/drop-function.md) statement, then upgrade the shared library and finally run the CREATE FUNCTION statement. If you upgrade without following this process, you may crash the server.

## Examples

```sql
DROP FUNCTION jsoncontains_path;
```

IF EXISTS:

```sql
DROP FUNCTION jsoncontains_path;
ERROR 1305 (42000): FUNCTION test.jsoncontains_path does not exist

DROP FUNCTION IF EXISTS jsoncontains_path;
Query OK, 0 rows affected, 1 warning (0.00 sec)

SHOW WARNINGS;
+-------+------+------------------------------------------------+
| Level | Code | Message                                        |
+-------+------+------------------------------------------------+
| Note  | 1305 | FUNCTION test.jsoncontains_path does not exist |
+-------+------+------------------------------------------------+
```

<sub>*This page is licensed: GPLv2, originally from*</sub> [<sub>*fill\_help\_tables.sql*</sub>](https://github.com/MariaDB/server/blob/main/scripts/fill_help_tables.sql)

{% @marketo/form formId="4316" %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://mariadb.com/docs/server/server-usage/user-defined-functions/drop-function-udf.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.