Pls help me to complete a simple stored prcedure!

Question

Hi,
This is the DDL and the procedure I created.
Create table students
(id int, name varchar (20),score int,[status] varchar(10))
insert into students values (1001,'sachin',100,'pass')
insert into students values (1002,'Dravid',90,'pass')
insert into students values (1003,'Dhoni',30,'fail')
insert into students values (1004,'Kohli',29,'fail')
---Select * from students
create proc uspgetstudents (
@id int, @status varchar(10)) as
begin
select * from students where id=@id and [status]=@status
end
The procedure is just partially correct and I would need your help to complete this.
This procedure is used by .Net. When they pass the  parameters ID and status, it should retrieve the particular Id and status (the above procedure works fine). Now,My requirement is when they don't pass any parameters, it should retrieve
everything. Ie) Select * from students (like without the filters).
Can you please help me how to do this?

Answer 1

vskindia,
You can achieve that by passing NULL values to the procedure (you can also have NULL as default) and use the proc as below:
create proc uspgetstudents
(@id int=NULL, @status varchar(10)=NULL) --by default NULL if value not passed
as
begin
select *
from students
where id=ISNULL(@id,id) and [status]=ISNULL(@status,status) --when NULL take the column value as it is
end
Thanks,
Jay
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