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The External or View Level
The external or view level is the highest level of abstraction of database. It gives a window on the conceptual view, which permits the user to see only the data of interest to them. The user can be either an end user or an application program. There can be a lot of external views as any number of external schemas can be defined and they can overlap each other. It contains of the definition of logical records and relationships in the external view. It also has the methods for deriving the objects such as attributes, entities and relationships in the external view from the Conceptual view.
Logical DBMS Architecture
Question (a) Differentiate between the following terms: (i) Distributed Database v/s Distributed Database management System (ii) Homogeneous Distributed Database v/s Hete
What does Aggregation mean?
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A database will be made to store information about patients in a hospital. On arrival, each patient’s personal details (name, address, and telephone number) are recorded where poss
Define Physical and Logical independence Ans: Physical data independence: The ability to modify physical level without causing application program to be rewritten. Logic
What is ODBC ? ODBC - Open DataBase Connectivity which is also denoted by ODBC enable the integration of SQL along with a common-purpose programming language. ODBC expose data
Java program for horrizontal fragmentation in distributed database
Write a short note on QBE? Stands for "Query By Example." QBE is a feature involved along with various database applications which gives user-friendly techniques of running da
Introductory course and so does not require any fancy coding. I will provide a guidance document to help you in producing the solutions.
Problem: (a) Given the following relation: Stats(Name,Sex,Children, Occupation, Salary, Tax, Audits) Write SQL code to define the following security constraints: (i) User
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