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Use Delegation to Share Implementation
The delegation "Delegation comprises of catching an operation on one object and sending it to other object which is part, or related to first object. In this method, only meaningful operations are delegated to second object, and meaningless operations can be banned from being inherited accidentally".
It is actuality that inheritance is an event for implementing generalization, in which behaviour of super class is shared by all of its subclasses. But, sharing of behaviour is justifiable only when a true generalization relationship come across, that is, only when it can be said which subclass is a form of the super class.
A buyer for a large department store chain must place orders with an athletic shoe manufacturer six months prior to the time the shoes will be sold in the department stores. In par
It defines that no primary key value can be null. This is as the primary key is used to recognize individual tuple in the relation. So we will not be able to recognize the records
Which operator is Cartesian product in relational algebra? Cartesian product in relational algebra is a binary operator. (It requires two operands. e.g., P X Q)
WHAT IS DBMS
what is union compatable?
To eliminate duplicate rows (distinct operator) Example: SELECT DISTINCT DEPTNO FROM EMP;
Consider the subsequent relations for a database which keeps track of business trips of salespersons in a sales office: SALESPERSON (SSN, Name, start_year, Dept_no) TRIP (SSN, Fr
What is DAG? The class-subclass relationship is shown by a directed acyclic graph.eg: employees can be temporary or permanent. We might be create subclasses temporary \and perm
QUESTION (a) Using an appropriate example, explain what is a recursive function? (b) Explain in detail the C++ function given below. void search2(int list[],int n,int ele
what is entity in database system?
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