The database used for this question is a very simple one with the following schema: (Primary keys are bold, foreign keys are underlined) CUSTOMER (CustID, FirstName, LastName, City, Phone, Email)INVOICE (InvoiceNumber, CustID, Date)INVOICE_ITEM(InvoiceNumber, ItemNumber, Quantity)ITEM (ItemNumber, ItemName, UnitPrice) When a customer makes a purchase, an invoice is created. The invoice may be for many items. For example, in a single purchase, a customer might buy 10 Back Scratchers, 4 Hair Removers and a Dog Lead.Provide relational algebra (NOT SQL) queries to find the following information.NOTE:You can use the symbols s, P, etc., or the words’ PROJECT’, ‘RESTRICT’ etc. as you prefer. You do not need to try to make efficient queries – just correct ones.Where you use a join, always show the join condition. List the first and last names of Customers who come from the City named Perth.List the first and last names of customers who had transactions on 1st August 2020.List the price of the item called “Back Scratcher”List the first and last names of any customer who has purchased more than 10 “Back Scratchers” in a single transaction.List the names and quantities of items purchased on 1st August 2020 by the customer Peter Simpson.

1 Query: ∏FirstName, LastNameδCity = "Perth" (CUSTOMER) 2nd Query: ∏FirstName, LastName…

Answered: List the first and last names of…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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The database used for this question is a very simple one with the following schema: (Primary keys are bold, foreign keys are underlined)

CUSTOMER (CustID, FirstName, LastName, City, Phone, Email)

INVOICE (InvoiceNumber, CustID, Date)

INVOICE_ITEM(InvoiceNumber, ItemNumber, Quantity)

ITEM (ItemNumber, ItemName, UnitPrice)

When a customer makes a purchase, an invoice is created. The invoice may be for many items. For example, in a single purchase, a customer might buy 10 Back Scratchers, 4 Hair Removers and a Dog Lead.

Provide relational algebra (NOT SQL) queries to find the following information.

NOTE:

You can use the symbols s, P, etc., or the words’ PROJECT’, ‘RESTRICT’ etc. as you prefer.
You do not need to try to make efficient queries – just correct ones.
Where you use a join, always show the join condition.

List the first and last names of Customers who come from the City named Perth.
List the first and last names of customers who had transactions on 1^st August 2020.
List the price of the item called “Back Scratcher”
List the first and last names of any customer who has purchased more than 10 “Back Scratchers” in a single transaction.
List the names and quantities of items purchased on 1^st August 2020 by the customer Peter Simpson.

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