Question

I am trying to set a foreign key relationship between an Order_Items table and Parts table. I want to link the parts to products in the Order_Items table via foreign key. I have no issues doing this with other tables.

Here is how the Order_Items table is defined:

CREATE TABLE [dbo].[Order_Items](
    [order_id] [uniqueidentifier] NOT NULL,
    [product_number] [varchar](50) NOT NULL,
    [quantity_ordered] [int] NOT NULL,
    [product_tested] [bit] NULL,
 CONSTRAINT [PK_Order_Items] PRIMARY KEY CLUSTERED 
(
    [order_id] ASC,
    [product_number] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO
SET ANSI_PADDING OFF
GO
ALTER TABLE [dbo].[Order_Items]  WITH CHECK ADD  CONSTRAINT [FK_Order_Items_Orders] FOREIGN KEY([order_id])
REFERENCES [dbo].[Orders] ([order_id])
GO
ALTER TABLE [dbo].[Order_Items] CHECK CONSTRAINT [FK_Order_Items_Orders]

and Parts table:

CREATE TABLE [dbo].[Parts](
    [part_number] [varchar](50) NOT NULL,
    [product_number] [varchar](50) NOT NULL,
    [part_description] [varchar](max) NULL,
    [part_tested] [bit] NULL,
 CONSTRAINT [PK_Parts_1] PRIMARY KEY CLUSTERED 
(
    [part_number] ASC,
    [product_number] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

I have tried setting the unique constraint on both product_number columns, but I still get the error message in SQL Server 2005 Management Studio Express as:

"The columns in table 'Order_Items' do not match an existing primary key or UNIQUE constraint"

Answer 1

I ended up restructuring my entire database to get this to work and streamlined the table connections.