What Are Some Pros And Cons For Diagrams Pros And Cons Of The Two Ways To Show Function Dependence?

Pros and cons of the two ways to show function dependence? - what are some pros and cons for diagrams

Of the two options to show the dependence of the function, a method with an arrow, for example, customer number -> name, first name. The other approach is a pattern of dependency. Please help me find the advantages and disadvantages of using each method.