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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
+ Add column
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
document_id
user_id
opened_at
acknowledged_at
ip_address
reading_status
understanding_status
understanding_note
not_understood_reason
document_version
total_pages
pages_completed
last_page_number
resume_page_number
total_read_seconds
grace_started_at
grace_until
forced_at
completed_at
updated_at