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Mysql-how can I use a program to ensure the association between tables, instead of the primary and foreign keys?

Source: Internet
Author: User
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I am confused about this problem today: I have learned that, to ensure data operation and maintenance, no foreign keys are created, no associations are established with programs, and no foreign key relationships are established, but I don't know how to use a program to ensure the association relationship. what is the scenario of this sentence and how to ensure the join table query ??? Mysql primary and foreign key data database linked list query 

I am confused about this problem today: I have learned that, to ensure data operation and maintenance, no foreign keys are created, no associations are established with programs, and no foreign key relationships are established, but I don't know how to use a program to ensure the association relationship. what is the scenario of this sentence and how to ensure the join table query ???

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