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Consider entity type Employee with attributes empNumber (this is unique), empName, and the year when he/she was hired. An employee can either be a technical employee, a marketing employee, or a business executive. For a technical employee, we know his/her undergraduate degree major. For a marketing employee, we know the revenue generated by this employee to date. For a business executive, we know the number of years of experience.
Model the above using ER, translate the ER schema to SQL DDL. Include the ER schema, the SQL statements and appropriate screen shots showing that your CREATE TABLE statements succeeded into your submission document.
List any two significant differences between a file processing system and a DBMS. File Processing System vs. DBMS Data Independence - Data independence is the capacity t
Which is another name for weak entity? Child is another name of weak entity.
Data Warehousing & Mining 1. What is the concept of knowledge discovery in database? 2. Describe the following types of Multidimensional Data Models. • Stars, Snowflakes and
Attributes attached to an entity can be of various types. Simple The attribute that cannot be further separated into smaller parts and shows the basic meaning is known as a
In an E-R diagram how attributes are represented ? In an E-R diagram attributes are represented in a ellipse.
What is the role of ORDER By Clause? ORDER BY clause: The ORDER BY clause permits you to sort the records in your result set. The ORDER BY clause can just be used in select s
The First Normal Form (1NF) Let us first describe 1NF: Definition: A relation (table) is in 1NF if 1. There are no duplicate tuples or rows in the relation. 2.
Transactions And Concurrency Management Introduction One of the main benefits of storing data in an integrated repository or a database is to permit sharing of it betwee
What are the Requirements of algorithm designer Algorithm designer should: i) Select proper algorithm so as to minimize implementation cost ii) Find most appropriate d
explain exhaustively the problems associated with ER diagrams. include illustrations in your answer
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