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Differance between internal and external schema?
Internal and external schema: Internal Schema• Describes the physical storage structure• Uses a physical data model External Schema• Includes a number user views• Uses a conceptual or an implementation data model
Express the following queries in SQL: (a) Write the SQL code that will create ALL the four tables given in the appendix. Your answer should not contain the primary key and
Illustrate the Deployment Diagram A deployment diagram shows all nodes on network, their processor execution and interconnections. In a dynamic model, this is used to represen
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
Section A: Use the following tables to create a database called College. Use SQL commands. Student stuid(primary) lastName firstName
This constraint shows that the key attribute value in each tuple must be unique, i.e., no two tuples have the similar value for the key attribute. This is because the value of the
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
1. Will you advise that your organization uses open source software and why? 2. Why is it important for business managers to have a basic understanding of the software development
What is hash file organization? What are the causes of bucket overflow within a hash file organization? What can be completed to decrease the occurrence of bucket overflow?
An example of a weak entity is Staff because the availabilityID cannot be uniquely identified unless it is used in conjunction with the foreign key known as availabilityID in the A
What is deadlock? Neither of the transaction can ever proceed with its normal implementation. This situation is known as deadlock.
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