Function of 'Declare' in Stored Procedure statements

Question

Dear Readers,
Can someone tell me what is the difference when we use Declare and don't use declare in the create stored procedure statement. Please see below:
Create proc education
AS
 Declare @name varchar(20)
Select @name='John'
GO
When I run this store procedure nothing is happening, I don't know why?
BUT
When I run the same procedure without Declare it runs. see e.g. below:
Create Proc learn
@name varchar(20)
AS
Select @name
GO
It runs successfully. What is the difference between Declare  and when I don't use Declare?

Answer 1

Try:
Create proc education
AS
Declare @name varchar(20)
Select @name='John'
Select @name
GO
exec education;
-- John
The first SELECT is only an assignment statement. You can use SET as well.
Create proc education1
AS
Declare @name varchar(20)
SET @name='John'
Select @name
GO
exec education1;
-- John
In the parameterized sp, the @name is set when the sp is called (exec).
Example for stored procedure with parameters:
http://www.sqlusa.com/bestpractices2008/stored-procedure-parameters/
Kalman Toth Database & OLAP Architect
SQL Server 2014 Database Design
New Book / Kindle: Beginner Database Design & SQL Programming Using Microsoft SQL Server 2014