Agreegation ->
Representing a whole work as one entity is agreegation
Example - Student Payment Registration Advisor
In ternary relationship , There can be only three connection .
We can connect Student with payment and Registration . Send it to advisor as one entity . This is called agreegation .
Specialization
Generalization
Recursion
Redundant
Multi Row function
Take more than one as input
Employee -> Sum_Salary , Max_Salary, Average_Salary , Min_Salary
Total Employee -> Have to count
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