What does 'cannot delete or update a parent row: a foreign key constraint fails' mean in sql?

Example:

DELETE FROM users WHERE id = 1;

You're trying to delete or update a record that has related data in another table due to a foreign key constraint.

Solution:

First, delete or update the related records in the child table, or reconsider the need to delete/update the record.


DELETE FROM orders WHERE user_id = 1;
DELETE FROM users WHERE id = 1;

Beginner's Guide to SQL