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. 2. calculus: Write the following queries in either tuple relational calculus or domain relational (a) Find the names of suppliers who supply some red part. (b) Find the sids of suppliers who supply every red or green part. (c) Find the pids of the most expensive parts supplied by suppliers named Yosemite Sham.
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. 2. calculus: Write the following queries in either tuple relational calculus or domain relational (a) Find the names of suppliers who supply some red part. (b) Find the sids of suppliers who supply every red or green part. (c) Find the pids of the most expensive parts supplied by suppliers named Yosemite Sham.
Chapter2: Database Design Fundamentals
Section: Chapter Questions
Problem 5RQ: What is a relation?
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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.
Transcribed Image Text:2.
calculus:
Write the following queries in either tuple relational calculus or domain relational
(a) Find the names of suppliers who supply some red part.
(b) Find the sids of suppliers who supply every red or green part.
(c) Find the pids of the most expensive parts supplied by suppliers named Yosemite Sham.
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