Choosing the next topic for reviews I made up my mind to clear up things with many-to-many relation of different services, as this functionality is used pretty often.One of good examples of many-to-many relations lies in students registering for courses: one student can attend one or more courses, and one course can be attended by one or more students.
Or a customer may have multiple reasons for making a purchase, and a purchase reason can be associated with multiple purchases.
So, in the upcoming posts I am going to analyze the approach of various systems to many-to-many relation implementation.
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