Consider the following schema: Suppliers(sid: integer, sname: string, address: string) Parts(pid: integer, pname: string, color: string) Catalog(sid: integer, pid: integer, cost: real) The key fields are underlined, and the domain of each field is listed after the field name. Therefore sid is the key for Suppliers, pid is the key for Parts, and sid and pid together form the key for Catalog. The Catalog relation lists the prices charged for parts by Suppliers. 1. Write the following queries in relational algebra: (a) Find the sids of suppliers who supply some red or green part. (b) Find the sids of suppliers who supply every red part or supply every green part. (c) Find the pids of parts supplied by every supplier at less than $200. (If any supplier either does not supply the part or charges more than $200 for it, the part is not selected.)
Consider the following schema: Suppliers(sid: integer, sname: string, address: string) Parts(pid: integer, pname: string, color: string) Catalog(sid: integer, pid: integer, cost: real) The key fields are underlined, and the domain of each field is listed after the field name. Therefore sid is the key for Suppliers, pid is the key for Parts, and sid and pid together form the key for Catalog. The Catalog relation lists the prices charged for parts by Suppliers. 1. Write the following queries in relational algebra: (a) Find the sids of suppliers who supply some red or green part. (b) Find the sids of suppliers who supply every red part or supply every green part. (c) Find the pids of parts supplied by every supplier at less than $200. (If any supplier either does not supply the part or charges more than $200 for it, the part is not selected.)
Chapter2: Database Design Fundamentals
Section: Chapter Questions
Problem 5RQ: What is a relation?
Related questions
Question
show all the work
Transcribed Image Text:Consider the following schema:
Suppliers(sid: integer, sname: string, address: string)
Parts(pid: integer, pname: string, color: string)
Catalog(sid: integer, pid: integer, cost: real)
The key fields are underlined, and the domain of each field is listed after the field name. Therefore
sid is the key for Suppliers, pid is the key for Parts, and sid and pid together form the key for
Catalog. The Catalog relation lists the prices charged for parts by Suppliers.
1.
Write the following queries in relational algebra:
(a) Find the sids of suppliers who supply some red or green part.
(b) Find the sids of suppliers who supply every red part or supply every green part.
(c) Find the pids of parts supplied by every supplier at less than $200. (If any supplier either
does not supply the part or charges more than $200 for it, the part is not selected.)
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 2 steps
Recommended textbooks for you
A Guide to SQL
Computer Science
ISBN:
9781111527273
Author:
Philip J. Pratt
Publisher:
Course Technology Ptr
Principles of Information Systems (MindTap Course…
Computer Science
ISBN:
9781285867168
Author:
Ralph Stair, George Reynolds
Publisher:
Cengage Learning
A Guide to SQL
Computer Science
ISBN:
9781111527273
Author:
Philip J. Pratt
Publisher:
Course Technology Ptr
Principles of Information Systems (MindTap Course…
Computer Science
ISBN:
9781285867168
Author:
Ralph Stair, George Reynolds
Publisher:
Cengage Learning
Programming with Microsoft Visual Basic 2017
Computer Science
ISBN:
9781337102124
Author:
Diane Zak
Publisher:
Cengage Learning
Database Systems: Design, Implementation, & Manag…
Computer Science
ISBN:
9781305627482
Author:
Carlos Coronel, Steven Morris
Publisher:
Cengage Learning
Database Systems: Design, Implementation, & Manag…
Computer Science
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:
Cengage Learning