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Objectives
After reading this part, you should be able to:
coventions for displaying an ER schema as ER diagram
What are the properties of transaction? There are three properties of transactions :- A) Atomicity B) Consistency C) Isolation
What is a view? Make a view of EMP table named DEPT 20, to display the employees in department 20 and their annual salary. Ans: View is a virtual table that does not consist
Create 1 experiment to demonstrate an aspect of query optimisation by using access-path structures (indexes), decomposition, or denormalisation. Once satisfied with your experiment
List the table modification commands in SQL? A) Deletion B) Updates C) Insertion D) Update of a view
what are the topics in data management
Consider the relation PERSON. If you want to display details of persons having age less than or equal to 30 than the select operation will be used as follows: σ AGE The resu
Describe the storage structure of indexed sequential files and their access method. Ans: Index offers a lookup capability to rapidly reach the vicinity of the desired record.
word limit no mentioned
Before we talk about the relational model in more detail, let us first define some very basic terms used in this model. Tuple Every row in a table shows a record and is cal
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