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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.
What are the various properties of Relational tables? Relational tables have 6 properties: 1. Each row is unique. 2. Column values are of the same kind. 3. Values are
Objectives After reading this unit you should be able to: Explain storage of databases on hard disks; Discuss the execution of various file Organisation techniques;
Using Column aliases Example: To print column names as NAME and ANNUAL SALARY SELECT ENAME "NAME", SAL*12 "ANNUAL SALARY" FROM EMP;
With the help of an example display how records can be deleted and updated in QBE. (i) Increase Pay_Rate of employees along with the skill of ‘cook' by 10%. (ii) Delete employee
Describe the difference between a one-to-many and a many-to-many relationship. Which logical data structures comprise one-to-many and which comprise many-to-many relationship?
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.
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What are deadlocks? How can they be avoided? Ans: Deadlock considers to a particular condition when two or more processes are every waiting for another to release a resource,
What is Nested Trigger? A trigger can also having INSERT, UPDATE and DELETE logic within itself, so when the trigger is fired because of data modification it can also cause ano
Consider the following relations: BRANCH( bno, street, area, city, pcode, Tel_no, Fax_no) STAFF( Sno, Fname, Lname, address, position , salary, bno) Express the subsequent qu
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