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Assignment No. 2
Semester Fall 2014
Database Management Systems – CS403
Total Marks: 20
Due Date: 12th Dec 2014
The assignment has been designed to develop your ability to identity the Entities and their Attributes and to draw the Entity Relationship Diagrams
Please read the following instructions carefully before solving & submitting assignment:
Question 1 [20 Marks]
Read the two scenarios given below and identify the Entities and then identify Attributes related to these entities and hence draw the Entity Relationship Diagram (ERD) in both cases given below.
a) A company has a number of employees having their name, address and date of birth. The company has several projects having a code, description and start date. Some employees are given salary one hourly based work with fixed per hour rate while other are one payroll and have fixed per month salary plus residence allowance. Each employee is assigned one or more projects and he may not be assigned to any project. A project must have at least one employee and may have more than one employees assigned.
b) A laboratory has several chemists who work on various projects and who may use certain kind of equipment on each project, there are also different chemicals involved in a project that a chemist may use chemicals have a name, number and the quantity. Chemist has a name and phone number, while project has an id and start date. Equipment can have a number and its price.
Notice. You may use MS Word, MS Vision or any other drawing tool but not paint. After drawing the diagrams you have to past them in MS Word file and to send a single MS word file.
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Discuss the relation buddies...
Employee to project many to many n 1 compurslry ko kiss smbol sy show krna h??
employess (attributes: name,address,DOB)
Project(code,description and start date)(employees)
employee(salaray)(hourly based and fixed per month)
project k sath jo employee h usy kesy add krna h???
chemicals names,no and quantity
chemists name,phone no
projects id and start date
number of equipment and price
entities sb ko pta hn na relations discuss krain sb pls
ni smj ari
plz explain it
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