MS SQL Server Concepts and Programming Question:

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If a stored procedure is created with parameters, you need pass values to those parameters when calling the stored procedure with one of two formats listed below:

-- Passing values only
EXEC procedure_name value_1, value_2, ... value_n;

-- Passing name-value pairs
EXEC procedure_name
@parameter_1 = value_1,
@parameter_2 = value_2,
...
@parameter_n = value_n;

The tutorial exercise below shows 2 ways to pass values to stored procedure parameters:

DROP PROCEDURE Hello;
GO

CREATE PROCEDURE Hello
@url nvarchar(40)
AS
PRINT 'Welcome to ' + @url;
GO

EXEC Hello 'globalguideline.com';
GO
Welcome to globalguideline.com

EXEC Hello @url='globalguideline.com';
GO
Welcome to globalguideline.com