# DROP FUNCTION Statement in Confluent Cloud for Apache Flink Confluent Cloud for Apache Flink® enables registering custom user-defined functions (UDFs) by using the [CREATE FUNCTION](create-function.md#flink-sql-create-function) statement. To remove a registered UDF from the current database, use the DROP FUNCTION statement. ## Syntax ```sql DROP FUNCTION [IF EXISTS] [[].[]]. ``` ## Description Delete a user-defined function (UDF) in Confluent Cloud for Apache Flink. When you provide the IF EXISTS clause and the function doesn’t exist, no action is taken. #### WARNING Dropping a function that other statements depend on can permanently break the other statements. If you drop a function and delete its artifact while a dependent statement is stopped or failed, but not deleted, that statement can’t resume and fails with an artifact-not-found error, because its compiled plan still points to the deleted artifact. Before you drop such a function, follow [Update a UDF safely](../../how-to-guides/create-udf.md#flink-sql-update-udf). ## Examples ```sql DROP FUNCTION IF EXISTS ``; ``` ## Related content - [CREATE FUNCTION](create-function.md#flink-sql-create-function) - [SHOW FUNCTIONS](show.md#flink-sql-show-functions) - [Create a User-Defined Function](../../how-to-guides/create-udf.md#flink-sql-create-udf) - [Update a UDF safely](../../how-to-guides/create-udf.md#flink-sql-update-udf) #### NOTE This website includes content developed at the [Apache Software Foundation](https://www.apache.org/) under the terms of the [Apache License v2](https://www.apache.org/licenses/LICENSE-2.0.html).