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Foreign key constraints
Actions Constraint properties Column Creating a foreign key over a non-indexed column would automatically create an index on it. Alternatively, you can define an index below, before creating the foreign key. Foreign key constraint (INNODB)
Database Table Column
ON DELETE ON UPDATE
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Internal relationships Documentation
Column Internal relation An internal relation is not necessary when a corresponding FOREIGN KEY relation exists.
mpin_id
school_code
teacher_id
mobile
mpin_hash
mpin_salt
is_mpin_set
failed_attempts
locked_until
last_login_at
last_changed_at
is_active
delete_status
created_at
updated_at