b1. Consider a relational database about real estate that is maintained by a real estate agency. The database consists of the following table (where the primary keys are underlined): House (id, asking price, address, postal code, baths, beds, saft, selleriD) Seller(id, name, home phone, e-mail, agentID) Buyer(id, name, homephone, e-mail, agentID) Agent(id, name, mobile phone, e-mail) Sold(house id, buyer id, sale-date, selling price) Where House gives information about a house for sale, seller gives information about the sellers of a house, Buyer gives information about (prospective) home buyers, Agent gives information about agents (who can act on behalf of either the buyer or the seller), and sold gives information about the sale of a particular home – including the price at which the home sold, which may differ from the asking price. Answer the following questions in relational algebra: i For each postal code in which there were at least three houses sold, find the postal code and the average selling price of houses in that postal code. ii. Find the addresses and asking prices of all houses that have at least 3 bedrooms and two bathrooms that have not sold. Each address, asking price pair should appear only once.
b1. Consider a relational database about real estate that is maintained by a real estate agency. The database consists of the following table (where the primary keys are underlined): House (id, asking price, address, postal code, baths, beds, saft, selleriD) Seller(id, name, home phone, e-mail, agentID) Buyer(id, name, homephone, e-mail, agentID) Agent(id, name, mobile phone, e-mail) Sold(house id, buyer id, sale-date, selling price) Where House gives information about a house for sale, seller gives information about the sellers of a house, Buyer gives information about (prospective) home buyers, Agent gives information about agents (who can act on behalf of either the buyer or the seller), and sold gives information about the sale of a particular home – including the price at which the home sold, which may differ from the asking price. Answer the following questions in relational algebra: i For each postal code in which there were at least three houses sold, find the postal code and the average selling price of houses in that postal code. ii. Find the addresses and asking prices of all houses that have at least 3 bedrooms and two bathrooms that have not sold. Each address, asking price pair should appear only once.
Database Systems: Design, Implementation, & Management
11th Edition
ISBN:9781285196145
Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Publisher:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Chapter10: Transaction Management And Concurrency Control
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:b1.
Consider a relational database about real estate that is maintained by a real estate agency. The
database consists of the following table (where the primary keys are underlined):
House (id, asking.price, address, postal.code, baths, beds, saft, sellerID) Seller(id, name, home phone,
e-mail, agentID) Buyer(id, name, home phone, e-mail, agentID) Agent(id, name, mobile phone, e-mail)
Sold(house id, buyer id, sale-date, selling price)
Where House gives information about a house for sale, seller gives information about the sellers of a
house, Buyer gives information about (prospective) home buyers, Agent gives information about agents
(who can act on behalf of either the buyer or the seller), and sold gives information about the sale of a
particular home – including the price at which the home sold, which may differ from the asking price.
Answer the following questions in relational algebra:
į For each postal code in which there were at least three houses sold, find the postal
code and the average selling price of houses in that postal code.
ii. Find the addresses and asking prices of all houses that have at least 3 bedrooms and two bathrooms
that have not sold. Each address, asking price pair should appear only once.
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