How can I solve this error

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The DELETE statement conflicted with the REFERENCE constraint "FK_Cart_Product".The conflict occurred in database "FinalProject", table "dbo.Cart", column 'ProductID'.
The statement has been terminated.

What I have tried:

Is this because of not allowing nullable to column PRoductId

Posted 24-Mar-18 5:47am

Member 13720022

Updated 24-Mar-18 6:06am

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GuyThiebaut · Accepted Answer · 2018-03-24T06:08:00

It's difficult to give an exact answer without seeing your actual delete statement and the exact error message, however...

A foreign key constraint violation is thrown when you try to delete a parent record for which there are children rows in a related table.

So you need to delete the child rows first.

For example deleting a product from the product table would be a problem if that product was present in the orders table.

So in the case I illustrate above you would need to first delete every order line containing that product then delete the product from the product table.
Which you probably would not want to do as you would be deleting history related to the product.

So the question is - are you sure you really want to delete that record as the foreign key constraint is there for a very good reason?

If you are sure you want to delete the row you will first need to delete every occurrence of the ProductID in all the table bound by the foreign key constraint.