Altering User-Defined Functions

We can modify the user defined functions by using the Alter command.

The Syntax as shown below

Scalar-valued Functions

ALTER FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ][ type_schema_name. ] parameter_data_type     [ = default ] }     [ ,...n ]   ] ) RETURNS return_data_type     [ WITH [ ,...n ] ]     [ AS ]     BEGIN         function_body         RETURN scalar_expression     END [ ; ]

Table-valued Functions

ALTER FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ] [ type_schema_name. ] parameter_data_type     [ = default ] }     [ ,...n ]   ] ) RETURNS @return_variable TABLE     [ WITH [ ,...n ] ]     [ AS ]     BEGIN         function_body         RETURN     END [ ; ]


The below shows how a function has been modified to change the message

ALTER FUNCTION USFORMATPHONE(@PhoneNumber varchar(25))
RETURNS Varchar(50) AS
BEGIN

DECLARE @phone varchar(50)

IF(LEN(@PhoneNumber) = 10)
SET @phone = '('+ SUBSTRING(@PhoneNumber,1,3) + ')' + SUBSTRING(@PhoneNumber,4,3) + '-' + SUBSTRING(@PhoneNumber,7,4)
ELSE
SET @phone = 'Phone Number is invalid'


Return @phone

END

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