Exercise 5.2 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 Catalog relation lists the prices charged for parts by Suppliers. Write the following Queries in SQL:

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Exercise 5.2 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 Catalog relation lists the prices charged for parts by Suppliers. Write
the following
Queries in SQL:
SQL: Queries, Programming, Triggers 43
1. Find the pnames of parts for which there is some supplier.
2. Find the snames of suppliers who supply every part.
3. Find the snames of suppliers who supply every red part.
4. Find the pnames of parts supplied by Acme Widget Suppliers and by no
one else.
5. Find the sids of suppliers who charge more for some part than the
average cost of
that part (averaged over all the suppliers who supply that part).
6. For each part, find the sname of the supplier who charges the most for
that part.
7. Find the sids of suppliers who supply only red parts.
8. Find the sids of suppliers who supply a red part and a green part.
9. Find the sids of suppliers who supply a red part or a green part.
Transcribed Image Text:Exercise 5.2 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 Catalog relation lists the prices charged for parts by Suppliers. Write the following Queries in SQL: SQL: Queries, Programming, Triggers 43 1. Find the pnames of parts for which there is some supplier. 2. Find the snames of suppliers who supply every part. 3. Find the snames of suppliers who supply every red part. 4. Find the pnames of parts supplied by Acme Widget Suppliers and by no one else. 5. Find the sids of suppliers who charge more for some part than the average cost of that part (averaged over all the suppliers who supply that part). 6. For each part, find the sname of the supplier who charges the most for that part. 7. Find the sids of suppliers who supply only red parts. 8. Find the sids of suppliers who supply a red part and a green part. 9. Find the sids of suppliers who supply a red part or a green part.
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