MySQL不显示也是主键的外键

Question

Navicat does not show primary keys which are also foreign key on table report as foreign keys. Why?

I gave the image explaining the situation:

Answer 1

A foreign key is a constraint that applies only to the referencing table. In your case, the translate_talent_id field has a foreign key constraint that references another field of another table.

On the other hand, translator_id is probably referenced by foreign keys in other tables. However, such foreign keys won't appear (or have any effect) on the the referenced table ( trl_translator in this case). That is why your MySQL client is not showing any foreign keys on translator_id .