How to write a Stored Procedure for Optional Search?

How to write a Stored Procedure for Optional Search?

--Create Table

create table stu_details(id int primary key identity,namenvarchar(30),class int)

 --**************************************************************

--insert record

insert into stu_details(name,class) values

         ('rahul',14),

         ('Ramu',20),

         ('Rahul',13),

         ('rahul',14),

         ('rani' ,15),

         ('RANI' ,15),

         ('RANI' ,15),

         ('Raju' ,12),

         ('Raju' ,12),

         ('rashmi',18),

         ('Roza' ,17),

         ('rani' ,15),

         ('kush',23)

--***************************************************************

--Show Record

select * from stu_details

--***************************************************************

--Creating stored Procedure for Optional Search

Create proc usp_search

@id int=0,

@name nvarchar(30)=null,

@class int=0

as

BEGIN

select * from stu_details where

(id=@id or COalesce(@id,'')=0)

and (name=@name or COALESCE(@name,'')='')

and (class=@class or COALESCE(@class,'')=0)

END