Question

Apologies for creating a new thread. I was not able to frame the question correctly in the previous thread.

I have a table in SQL Server 2008 that looks like this –

Id      Status
--------------
1        A
2        I
3        NULL

I have a stored procedure which takes @Status as the parameter.

If the @Status is "-1", I need to retrieve records 1, 2. 
If the @Status is "A", I need to retrieve only record 1.
If the @Status is "I", I need to retrieve only record 2.

I want to be able to retrieve the records in a single SELECT statement without using IF ELSE. There are a lot of joins and stuff in the SELECT statement and I don’t want to repeat the same thing in the ELSE condition.

I have tried the following but get incorrect data –

SELECT * FROM Person WHERE Status = @Status OR @Status IS NOT NULL

select * from Person
where (@Status is not null and Status = @Status) or
      (@Status is null and Status in ('A', 'P')) 

Answer 1

You can do it using OR:

SELECT *
FROM Person
WHERE Status = @Status
OR (@Status = '-1' AND Status IS NOT NULL)

Of course you shouldn’t use SELECT * in production code.