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Consider the relations
EMPLOYEE(emp#, name) ASSIGNED_TO(project#, emp#) PROJECT(project#, project_name, chief) Express the subsequent queries in Relational Algebra
(i) Get details of employee working on both comp354 and comp345 project numbers. (ii)Find out the employee number of employee who do not work on project comp678
(i) EMPLOYEE (ASSIGNED TO ÷∏project # (σ(project#='comp351' ∨ project#='comp 345 ASSIGNED _TO))) (ii) ∏Emp#(EMPLOYEE)-∏Emp# (project#='c 678' ASSIGNED_TO))
What are the types of storage devices? Primary storage Secondary storage Tertiary storage Volatile storage Nonvolatile storage
Why 'AS' clause is used in SQL ? 'As' clause is used for Rename operation. ‘AS' clause is used in SQL for rename operation. (e.g., SELECT ENO AS EMPLOYEE_NO FROM EMP)
Aggregation : One limitation of the E-R diagram is that they do not permit representation of relationships between relationships. In such a case the relationship along with its ent
Problem 1. Write the SQL queries using Data Manipulation Language (DML) statements. Insert values into student table with field names using insert command Display the
Need For Distributed Database Systems A distributed database is a set of database kept on multiple computers that appears to applications as a one database. As a result, an app
What is a query tree? Ans: A query tree, as well known as operator graph, is a tree data structure that corresponds to a relational algebra expression. It denotes the inpu
The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.
what are the states of transaction?
Rules Of Data Normalisation Let us now summarise Normalisation with the help of various clean rules. The following are the necessary rules for the Normalisation process: 1.
Answer SQL Queries to extract data from data tables and questions on mapping conceptual data models into relational data model.
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