DF216: User defined-function name begins with ‘fn_’.

The topic describes the DF216 T-SQL code analysis rule.

Category

NAMING CONVENTIONS

Message

User defined-function name begins with ‘fn_’.

Description

It is recommended to avoid using the ‘fn_’ prefix for user-defined function names, as this prefix is commonly reserved for system functions.

Noncompliant code example

CREATE FUNCTION dbo.fn_DemoFunction(@x INT)
     RETURNS INT
AS
BEGIN
    RETURN @x + @x
END
GO

Compliant solution

CREATE FUNCTION dbo.udf_DemoFunction(@x INT)
     RETURNS INT
AS
BEGIN
    RETURN @x + @x
END
GO