The FOREIGN KEY constraint also prevents invalid data from being inserted into the foreign key column, because it has to be one of the values contained in the table it points to.
Additionally, My SQL requires that the referenced columns be indexed for performance reasons.
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The references to the Color, Make and Model tables aren't the issue--you're attempting to drop/delete the child in a parent-child relationship.
Once you have retrieved data from a table that has foreign key relations to other tables, you can navigate the relationship for specific rows in the result set.
Unlike on-disk tables, there is no locking and write-write conflicts are detected (error 41302) if concurrent transactions update the same rows.If all validation succeeds, then the transaction commits.The summary of the validation errors is in the article While testing a customer workload we encountered a delete transaction that was under the Snapshot Isolation level that was still failing with one of the validation errors 413235 listed above.The table containing the foreign key is called the child table, and the table containing the candidate key is called the referenced or parent table.Primary keys serve as unique identifiers for the records in a table, while foreign keys are used to link related tables together.
A foreign key is a way to enforce referential integrity within your SQL Server database.