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Illustration of implementation of inheritance
Let us take the illustration of implementation of inheritance. Suppose that we are about to implement the Stack class and by now we have a List class available. You can be tempted to create Stack inherit from List. Pushing an element onto stack can be achieved by adding an element to end of list and popping an element from a stack corresponds to removing an element from end of the list. But, you are also inheriting unwanted list operations which add or remove elements from arbitrary positions in list.
Relationship between Security and Integrity: Database security usually refers to access, while database integrity refers to avoidance of accidental loss of consistency. But usually
The database application project (DAP) for this assignment consists of the creation of a fully functional Microsoft Access database application for a real client. I recommend you s
Discuss the differences among the candidate keys and the primary key of a relation. Give instance to describe your answer? A candidate key is one that can be used as primary ke
BCNF Boyce-Codd Normal Form A relation schema R is in BCNF if it is in 3NF and accepts an additional constraint that for every FD X A, X has to be a candidate key. If a relati
Differentiate sub-class and super-class? The specialization of a class is known as subclasses.eg: employee is a subclass of person and teller is a subclass of employee. Convers
what is difference between circular inked lust and grunded linked list
The database files accept the actual data and are typically the biggest in size. Depending on their shape, the tables for all the user operation can go in one database file-but
Modify a sequence: ALTER SEQUENCE SEQSS INCREMENT 2 MAXVALUE 3000; Removing a sequence: DROP SEQUENCE SEQSS;
(a) Why did SAP introduce the extended star schema?
A model in database system mostly defines the organisation of data or structure and a set of operations on that data. Relational model is a easy model in which database is represen
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