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Solutions to circular foreign key constraints and multi-level cascading paths in SQL Server
When using foreign key constraints to enforce data integrity, you may encounter errors indicating potential loops or multi-level cascading paths. This error occurs when you try to define a foreign key relationship that may cause data inconsistency on delete or update operations.
Problem Analysis
In your specific case, you are trying to create a foreign key constraint between the code table and the employees table. Each employee references a specific type of code, which can result in multiple foreign key references in the employees table.
Set null value when deleting
To ensure referential integrity, ideally you want to set the referenced fields in the employees table to null if the corresponding code in the code table is deleted. However, SQL Server prohibits loops or multi-level cascading paths, which can cause data corruption.
Solution
To resolve this issue, you may consider the following options:
By adopting one of these methods, you can effectively resolve errors and ensure data integrity in your database.
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