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INTRODUCTION
Databases and database systems have become an essential part of our daily life. We encounter many activities that involve some interaction with a database almost daily. The examples include withdrawal from a bank and/or deposit, hotel, railway reservation or airline, accessing a computerised library, order a magazine subscription from a purchase items, publisher from supermarkets. In all the above given cases a database is accessed. These may be known as Traditional Database Applications. In these kinds of databases, the information stored and accessed is numeric or textual. Though, with advances in technology in the past few years, dissimilar databases have been developed such as Multimedia Databases that sound messages, store pictures, and video clips,; Geographical Information Systems (GIS) that can store maps, satellite images, and weather data etc., and Real time databases that can control industrial and manufacturing processes. In this section, we will be introducing the concepts involved in the Database Management System.
Define the terms i) DDL ii) DML DDL: Data base schema is particular by a set of definitions expressed by a special language known as a data definition language. DML: A data
#question.explain diversity and magnitude of organic compounds and general properties?
Question 1 Explain the concept of database recovery management. Explain the different levels of backup used for recovering data Question 2 What are the different types of par
What are the disadvantages of relational data ? Disadvantages • Performance - If the number of tables among that relationships to be established are large and the tables t
What is multiplicity in the associations? Give an example to explain multiplicity? Multiplicity in association indicate number of objects participate in any relationship. For
What is called a query evaluation plan? A sequence of primitive operations that can be used to assess a query is a query evaluation plan or a query implementation plan.
Problem: You are given the following schema 1. Flights(flno, from, to, distance) 2. Aircraft(aid, flno, aname, cruisingRange) 3. Certified(eid, aid) 4. Employees(eid, ena
write a short note on participation role? Participation role: roles are indicating in E-R diagram by labelling the lines that connect diamonds to rectangles.
what is 3nf
E-R Model This data model is based on real world that consists of basic objects named entities and of relationship among these objects. Entities are illustrated in a database
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