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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.
id
post_time
flag
update_time
sync_ret
emp_code
first_name
last_name
dept_code
dept_name
job_code
job_name
area_code
area_name
card_no
multi_area
hire_date
gender
birthday
email
active_status