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Asked: 2026-05-27T15:21:13+00:00

I have created a simple database in SQL Server Express which consists of three

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I have created a simple database in SQL Server Express which consists of three tables: Inventory, Customers, Orders.

I try to connect them in db diagram forcing the primary keys of Inventory and Customers (CarID and CustID) as foreign keys to Orders. However, when I try to save the diagram, I receive an error that does not allow me to save the diagram and link the tables.

The error indicates:

The ALTER TABLE statement conflicted with the FOREIGN KEY constraint
“FK_Orders_Inventory”. The conflict occurred in database “AutoLot”,
table “dbo.Inventory”, column ‘CarID’.

FK_Orders_Inventory is the connection between Inventory and Orders. What could be a potential cause of the error?

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1 Answer

  1. Editorial Team

    The data currently in the table is probably not conforming to the constraints you have defined.

    Make sure the data is consistent with the constraints before adding them.

    In this case, one of the foreign keys you are defining fails because the column you are defining it on (in the Inventory table) contains values that do not exist on the referenced column (CarId) in the foreign table.

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