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: 2. 3. (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.) 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. Express queries (a)(c) in the relational algebra, and queries (b)(d) in the domain relational calculus: (a) Find the names of suppliers who supply exactly one red part. (b) List supplier-part (sid-pid) pairs where the part has the highest cost from this supplier. (c) List the name of each supplier who has at least one part that is not available from all other suppliers. (d) List each part (pid) that is available from exactly one supplier.
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: 2. 3. (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.) 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. Express queries (a)(c) in the relational algebra, and queries (b)(d) in the domain relational calculus: (a) Find the names of suppliers who supply exactly one red part. (b) List supplier-part (sid-pid) pairs where the part has the highest cost from this supplier. (c) List the name of each supplier who has at least one part that is not available from all other suppliers. (d) List each part (pid) that is available from exactly one supplier.
Chapter2: Database Design Fundamentals
Section: Chapter Questions
Problem 5RQ: What is a relation?
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answer question 3
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:1.
Write the following queries in relational algebra:
2.
3.
(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.)
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.
Express queries (a)(c) in the relational algebra, and queries (b)(d) in the domain
relational calculus:
(a) Find the names of suppliers who supply exactly one red part.
(b) List supplier-part (sid-pid) pairs where the part has the highest cost from this supplier.
(c) List the name of each supplier who has at least one part that is not available from all other
suppliers.
(d) List each part (pid) that is available from exactly one supplier.
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