Question

I need to retrieve data from one table and use it to retrieve data from other table using stored procedure.

cart table
    CartId,
    PrdouctId -> should retrieve data from productinfo table 
    EmailId ->should Retrieve data from cart table that who many cart are register in this EmailId 
    cost,
    Quantity ,
    Ram -> contains HardWareId
    GraphicCard ->contains HardWareId
    ScreenSize ->contains HardWareId

ProductInfo Table
    ProductId,
    BrandlName,
    ModelName,
    Processor,

HardwareInfo table
    HardWareId,
    HardwareName,
    HarwareCost,

@EmailId will be supplied to the stored procedure

Select @ProductId =[productId],@Ram = [Ram] from cart where EmailId = @EmailId 
Select [BrandName],[ModelName] from ProductInfo where ProductId = @productId
select [HardwareName],[HardwareCost] from HardwareInfo where HardwareId = @Ram

BrandName, ModelName, Processor,Ram,GraphicCard,ScreeSize will be shown to user in list view.

Is correct the way that I’m trying to do it?

Answer 1

It looks like you want something like this.

create procedure GetCartByEmailId
  @EmailId int
as  

select P.BrandName,
       P.ModelName,
       HR.HardwareName as RamName,
       HR.HardwareCost as RamCost,
       HG.HardwareName as GraphicCard,
       HG.HardwareCost as GraphicCardCost,
       HS.HardwareName as ScreenSize
from Cart as C
  inner join ProductInfo as P
    on C.ProductId = P.ProductId
  left outer join HardwareInfo as HR
    on C.Ram = HR.HardwareID
  left outer join HardwareInfo as HG
    on C.GraphicCard = HG.HardwareID
  left outer join HardwareInfo as HS
    on C.ScreenSize = HS.HardwareID
where C.EmailId = @EmailId