Social ________ sites allow you to read opinions and write your own opinion of places such as hotels and restaurants
A) news B) networking C) review D) bookmarking
C
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Answer the following:
(a) The equivalence
where a1 and a2 are disjoint subsets of a satisfying a = a1
U a2 holds under certain conditions on a1, a2, and c. State the conditions.
(b) Using the schema:
Sailors(sid: integer, sname: string, rating: integer, age: real)
key - sid
Boats(bid: integer, bname: string, color: string)
key - bid
Reserves(sid: integer, bid: integer, day: date)
key - sid, bid, day
(c) Consider the SELECT statement:
SELECT S.sname, S.rating
FROM Sailors S, Reserves R
WHERE S.sid = R.sid AND R.day = '5/11/98'
which uses the schema of (7b). Express it as an unoptimized relational algebra expression
using the operators natural join, select, and project.
(d) Give an equivalent relational algebra expression for the same query that can be evaluated
more eciently. Explain why you expect more ecient evaluation (no numbers).
Each _________________________ contains a collection of groups.
Fill in the blank(s) with the appropriate word(s).
________ is the dependent cell with this formula in A10:=Sum(A2:A8)
Fill in the blank(s) with the appropriate word(s).
Networking devices allow the computers on a network to interact with each other.?
Answer the following statement true (T) or false (F)