error 1451 (23000): cannot delete or update a parent row: a foreign key constraint fails 1

error 1451 (23000): cannot delete or update a parent row: a foreign key constraint fails

SET FOREIGN_KEY_CHECKS = 0; -- to disable FK checks (ex: for delete purpose)
SET FOREIGN_KEY_CHECKS = 1; -- to re-enable FK checks 

Here is what the above code is Doing:
1. First, we disable the foreign key checks.
2. Then, we create a new table called users_backup.
3. Next, we insert all the data from the users table into the users_backup table.
4. Then, we drop the users table.
5. Next, we create a new users table with the new structure.
6. Finally, we insert all the data from the users_backup table into the users table.
7. Then, we drop the users_backup table.
8. Finally, we re-enable the foreign key checks.

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