Updated: October 28, 2015

THIS TOPIC APPLIES TO:yesSQL Server (starting with 2008)yesAzure SQL DatabaseyesAzure SQL Data Warehouse yesParallel Data Warehouse

Removes one or more user-defined functions from the current database. User-defined functions are created by using CREATE FUNCTION and modified by using ALTER FUNCTION.

The DROP function supports natively compiled, scalar user-defined functions. For more information, see Scalar User-Defined Functions for In-Memory OLTP.

Topic link icon Transact-SQL Syntax Conventions

 -- SQL Server (starting with 2008), Azure SQL Database 

DROP FUNCTION [ IF EXISTS ] { [ schema_name. ] function_name } [ ,...n ]   

 -- Azure SQL Data Warehouse, Parallel Data Warehouse 

DROP FUNCTION [ schema_name. ] function_name

Conditionally drops the function only if it already exists.

Is the name of the schema to which the user-defined function belongs.

Is the name of the user-defined function or functions to be removed. Specifying the schema name is optional. The server name and database name cannot be specified.

DROP FUNCTION will fail if there are Transact-SQL functions or views in the database that reference this function and were created by using SCHEMABINDING, or if there are computed columns, CHECK constraints, or DEFAULT constraints that reference the function.

DROP FUNCTION will fail if there are computed columns that reference this function and have been indexed.

To execute DROP FUNCTION, at a minimum, a user must have ALTER permission on the schema to which the function belongs, or CONTROL permission on the function.

A. Dropping a function

The following example drops the fn_SalesByStore user-defined function from the Sales schema in the AdventureWorks2012 sample database. To create this function, see Example B in CREATE FUNCTION (Transact-SQL).

DROP FUNCTION Sales.fn_SalesByStore;  

OBJECT_ID (Transact-SQL)
sys.sql_modules (Transact-SQL)
sys.parameters (Transact-SQL)

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