CS403 Assignment 2 Solution and Discussion

EDU302 Assignment No. 02
SEMESTER Spring 2019
CS403- Database Management System
Total Marks: 20

Due Date: 02/12/2019
Instructions
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Objectives
Objectives
The objective of this assignment is to able the Students:
• To understand the relational database model
• To understand the Conversion of ERD into relational data model
• To understand the Cartesian product of two relations
• To understand the degree and cardinalities of relations

Note:
Your answer must follow the below given specifications.
• Font style: “Times New Roman”
• Font color: “Black”
• Font size: “12”
• Bold for heading only.
• Font in Italic is not allowed at all.
• No formatting or bullets are allowed to use.
• Your answer should be precise and to the point, avoid irrelevant detail.

Lectures Covered: This assignment covers Lecture # 10 - 17
Deadline
Your assignment must be uploaded/submitted on or before 02/12/2019.

Question Statement

Our second assignment is the continuation of the first assignment. In the first assignment an ERD was required for the given scenario, which is given below:
262aed16-698e-443d-a680-5959bf8d3808-image.png

You’re required to perform the following tasks:

  1. Convert the above Entity Relationship Diagram into Relational data model.

You have to convert all the components of the ERD into Relational Data model.

  1. Consider the following two tables:

Order:

order_id order_status delivery_date btag_no cust_id sman_id
od001 Completed 10/30/2019 bt001 cust001 sm001
od002 Completed 10/30/2019 bt002 cust002 sm001
od003 Completed 10/30/2019 bt003 cust003 sm001

Bill:
bill_id cust_id order_id net_amount
b001 cust001 od001 500
b002 cust002 od002 550
b003 cust001 od003 600

And write the output of the following relational algebra operations:

• ∏ order_id, cust_id, sman_id (Order)
• σ net_amount > 500 (Bill)
• ∏ order_status, delivery_date (σ btag_no= ‘bt002’ (Order))

  1. Find the degree and cardinality of the relations (Order and Bill) given in the 2nd question.

====================================Ended=======================================

For any query about the assignment, contact at [email protected]

GOOD LUCK

You have to convert all the components of the ERD into Relational Data model.

Solution:
Customer(Customer_ID, Name, Address, Contact_No, email)
Order(Order_ID, Order_Status, Delivery_Date, Customer_ID, Manager_ID,Sman_ID)
Bill(Bill_ID, Order_ID, Amount, date)
Bottle(Bottle_Tag_No, Fillling_Date, Expiry_Date, Capacity, Order_ID)
Manager(Manager_ID, Name, Address)
Salesman(Sman_ID, Name, Contact_No)
SalesArea(Area_ID, Area_Name, Sman_ID)

  1. Consider the following two tables:

Order:

order_id order_status delivery_date btag_no cust_id sman_id
od001 Completed 10/30/2019 bt001 cust001 sm001
od002 Completed 10/30/2019 bt002 cust002 sm001
od003 Completed 10/30/2019 bt003 cust003 sm001

Bill:

bill_id cust_id order_id net_amount
b001 cust001 od001 500
b002 cust002 od002 550
b003 cust001 od003 600

And write the output of the following relational algebra operations:

• ∏ order_id, cust_id, sman_id (Order)

order_id cust_id sman_id
od001 cust001 sm001
od002 cust002 sm001
od003 cust003 sm001

• σ net_amount > 500 (Bill)

bill_id cust_id order_id net_amount
b002 cust002 od002 550
b003 cust001 od003 600

• ∏ order_status, delivery_date, (σ btag_no=’bt002’ (Order))

order_status delivery_date
Completed 10/30/2019
  1. Find the degree and cardinality of the relations (Order and Bill) given in the 2nd question.
Table Degree Cardinality
Order 6 3
Bill 4 3

Idea Solution from book
e003ca23-416d-440a-a397-af7c0e8b7c3a-image.png

You have to convert all the components of the ERD into Relational Data model.

Solution:
Customer(Customer_ID, Name, Address, Contact_No, email)
Order(Order_ID, Order_Status, Delivery_Date, Customer_ID, Manager_ID,Sman_ID)
Bill(Bill_ID, Order_ID, Amount, date)
Bottle(Bottle_Tag_No, Fillling_Date, Expiry_Date, Capacity, Order_ID)
Manager(Manager_ID, Name, Address)
Salesman(Sman_ID, Name, Contact_No)
SalesArea(Area_ID, Area_Name, Sman_ID)

  1. Consider the following two tables:

Order:

order_id order_status delivery_date btag_no cust_id sman_id
od001 Completed 10/30/2019 bt001 cust001 sm001
od002 Completed 10/30/2019 bt002 cust002 sm001
od003 Completed 10/30/2019 bt003 cust003 sm001

Bill:

bill_id cust_id order_id net_amount
b001 cust001 od001 500
b002 cust002 od002 550
b003 cust001 od003 600

And write the output of the following relational algebra operations:

• ∏ order_id, cust_id, sman_id (Order)

order_id cust_id sman_id
od001 cust001 sm001
od002 cust002 sm001
od003 cust003 sm001

• σ net_amount > 500 (Bill)

bill_id cust_id order_id net_amount
b002 cust002 od002 550
b003 cust001 od003 600

• ∏ order_status, delivery_date, (σ btag_no=’bt002’ (Order))

order_status delivery_date
Completed 10/30/2019
  1. Find the degree and cardinality of the relations (Order and Bill) given in the 2nd question.
Table Degree Cardinality
Order 6 3
Bill 4 3

Fall 2019_CS403_2_SOL.docx

30c67624-0f8f-4e9e-a873-7569122d5280-image.png

d82ce349-489c-4700-b32b-fc0b41809b24-image.png
Question No 2:
Order:
order_id order_status delivery_date btag_no cust_id sman_id
od001 Completed 10/30/2019 bt001 cust001 sm001
od002 Completed 10/30/2019 bt002 cust002 sm001
od003 Completed 10/30/2019 bt003 cust003 sm001
Bill:
bill_id cust_id order_id net_amount
b001 cust001 od001 500
b002 cust002 od002 550
b003 cust001 od003 600

And write the output of the following relational algebra operations:
• ∏ order_id, cust_id, sman_id (Order)

∏ Operator name is projection this is used to select all the colum in the table
It will select three colums, order_id, sman_id and cust_id. It also delete the unwanted colums on the basis of condition
• σ net_amount > 500 (Bill)
σ is used for selection. it select the subset of rows from table answer will be second and third row from bill table answer will be (550,600)
• ∏ order_status, delivery_date (σ btag_no= ‘bt002’ (Order))
In this it will first perform the selection and select the btag no row from order table then projection will be performed and in projection it will selct the colum order-status value and delivery date value where btag no is bt002.
Answer will be order status delivery date
Completed 10/30/2019

Question no 3:

  1. Find the degree and cardinality of the relations (Order and Bill) given in the 2nd question.
    (a)
    Degree = number of attributes or colums in the table is his degree
    Order table have 6 colums/attributes so its degree will be 6
    Bill table have 4 colums/attributes so its degree will be 4
    Degree of the (Order and Bill) will be
    Degree -> 6+4=10
    (b)
    Cardinality = numbers of tuples/rows in the table
    Number of rows in order table = 3
    Number of rows in bill table =3
    Cardinality of order and bill (rowsrows)
    Cardinality -> 3
    3 =9