SQL Schema Assignment Help
- June 1, 2017
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- Category: Computer Science QA
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1.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. The catalog relation lists the price changes for parts by supplies.
Write the following Queries in Relational Algebra and tuple relational calculus.
a)Find the sids of suppliees who supply some red part and some green part
b)Find the sids of suppliees who supply every part
c)Find the sids of suppliees who supply every red or green part
d)Find the pids of parts supplied by at least two different supplies.
2.Write the following queries in Tuple Relational Calculus for following Schema.
Sailors (sid: integer, sname: string, rating: integer, age: real)
Boa ts (bid: integer, bname: string, color: string)
Reserves (sid: integer, bid: integer, day: date)
i. Find the names of sailors who have reserved a red boat
ii. Find the names of sailors who have reserved at least one boat
iii. Find the names of sailors who have reserved at least t
3.Consider the relation scheme Emp Dept( Ename, SSN, Bdate, Address, Dnumber, Dname, DMGRSSN) and the following set of FD’s F={ SSN- > Ename, Bdate, Address, Dnumber
Dnumber- > Dname, DMGRSSN}
Calculate the closure of {SSN} + and {Dnumber} + with respect to F.
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4.What is grouping? Is there a counterpart in Relational Algebra? Explain this feature and discuss the interaction of the HAVING and WHERE clauses. Mention any restrictions that must be satisfied by the fields that appear in the GROUP BY Clause.
5.What are the differences between Integrity Constraints and Triggers.
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