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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
Drop Drop
ON DELETE ON UPDATE
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ON DELETE ON UPDATE
+ Add column
+ Add constraint
Internal relationships Documentation
Column Internal relation An internal relation is not necessary when a corresponding FOREIGN KEY relation exists.
id
create_time
create_user
change_time
change_user
status
first_name
last_name
email
enroll_sn
register_photo
register_time
approval_photo
approval_state
approval_time
remark
visitor_id