Question

I am working with SQL Server 2005.
I am having 3 table

Product

PId   |   PName

Service

SId   |   SName

Bill

BId   |   TypeId   |   IsService

TypeId is PId or SId. based on IsService Field.

If IsService is 1 then TypeId is SId and If IsService is 0 then TypeId is PId

I want to fetch PName and SName with Bill so how can I?

I am thinking of to Write stored Procedure for this..
and Adding Dynamic Column to Stored Procudure that column contain Either SName or PName as per IsService.

But don’t know how to write this also?

Answer 1

Maybe something like this:

SELECT
    Bill.*,
    CASE 
        WHEN Bill.IsService=1
        THEN Service.SName
        ELSE Product.PName
    END AS Name
FROM
    Bill
    LEFT JOIN Service
        ON Bill.TypeId=Service.SId
    LEFT JOIN Product
        ON Product.TypeId=Bill.BId