In general, the super keyword can be used to call overridden methods, access hidden fields or invoke a superclass's constructor. In fact, multiple inheritance is the only case where super() is of any use I would not recommend using it with classes using linear inheritance, where it's just useless overhead. As for chaining super::super, as i mentionned in the question, i have still to find an interesting use to that For now, i only see it as a hack, but it was worth mentioning, if only for the differences with java (where you can't chain super). Super e>) says that it's some type which is an ancestor (superclass) of e
Extends e>) says that it's some type which is a subclass of e (in both cases e itself is okay.) so the constructor uses the Extends e form so it guarantees that when it fetches values from the collection, they will all be e or some subclass (i.e I'm currently learning about class inheritance in my java course and i don't understand when to use the super() call I found this example of code where super.variable is used How do i call the parent function from a derived class using c++
Within each class there is a print Can't be called from main method I wrote the following code When i try to run it as at the end of the file i get this stacktrace 'super' object has no attribute do_something class parent So i was following python's super considered harmful, and went to test out his examples
If you add any other column/attribute to a primary key then it become a super key, like employeeid + fullname is a super key If a table don't have any individual columns that qualifies for a candidate key, then you have to select 2 or more columns to make a row unique.
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