Function module and a normal abap/4 subroutine, Database Management System

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What is the difference between the function module and a normal ABAP/4 subroutine?

In contrast to normal subroutines function modules have uniquely exact interface. Declaring data as common parts is not possible for function modules. Function modules are kept in a central library

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One-to-many relationship, For each 1: n relationship type R involving two e...

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Aggregation : One limitation of the E-R diagram is that they do not permit representation of relationships between relationships. In such a case the relationship along with its ent

Intersection, If R1 and R2 are two union compatible relations or functions,...

If R1 and R2 are two union compatible relations or functions, then the result of R3 = R1 ∩R2 is the relation that contains all tuples that are in both the relations In other words,

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