Question: Case: Suppose R is a relation with attributes A1,A2.... An. As a function of n, tell hovw many superkeys R has, if: a) The only

Case: Suppose R is a relation with attributes A1,A2.... An. As a function of n, tell hovw many superkeys R has, if: a) The only key is A1. b) The only keys are A1 and A2. c) The only keys are (A1, A2) and (A3, A4). d) The only keys are (A1, A2) and fA1, A3

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Databases Questions!

the following relational algebra questions based on tables S1 and S2 (below) Question 1 What is the output of S1 S2 ? The row identified by sid 22 The rows identified by sid 31 and 58 The row...

Suppose R is a relation with attributes A 1 , A 2 ,.An As a function of n, tell how many superkeys R has , if: Theonly keys are (A1, A2}and{A1,A3} Prove that {X + } + = {X} +

The current price for a stock index is 1,000. The following premiums exist for various options to buy or sell the stock index six months from now: Strike Price Call Premium Put Premium 950 120.41...

Applied Mathematics and Computation 95 (1998) 181192 Love dynamics: The case of linear couples Sergio Rinaldi 1 Centro Teoria dei Sistemi, CNR, Politecnico di Milano, Via Ponzio 34/5, 20133 Milan,...

Let A, B be sets. Define: (a) the Cartesian product (A B) (b) the set of relations R between A and B (c) the identity relation A on the set A [3 marks] Suppose S, T are relations between A and B, and...

Math\t107-6381\t-\tQuiz\t#4\t-\tSchultz\t-\tDue\tFebruary\t21,\t2016\t-\tpage\t1\tof 3 Follow\tthese\tdirections\tcarefully. This\tquiz\tis\tdue\tby\t11:59\tEastern\ttime\ton\tFebruary\t21,\t2016. o...

Exercises Chapter 2 2.1 Marginal and conditional probability: The social mobility data from Section 2.5 gives a joint probability distribution on (Y1 , Y2 )= (father's occupation, son's occupation)....

Consider the trigonometric series a0 2 + X r=1 (ar cos rx + br sin rx) where a0, a1, a2, . . . and b1, b2, . . . are constants and suppose that f(x) is a periodic function of x with period 2. (a)...

The new line character is utilized solely as the last person in each message. On association with the server, a client can possibly (I) question the situation with a client by sending the client's...

Algorithms in Artificial Intelligence (or, the old name: Introduction to Algorithmic Decision Making) Part 1 Based on slides by David Sarne and Lirong Xia Course Tentative Schedule Introduction...

Each of the balance sheet changes below and on p. 94 is associated with a particular transaction: a. Equipment increases by $5,000 and cash decreases by $5,000. b. Cash increases by $4,100 and...

A topology5 on a finite set X is a subset of TC 2X such that the following holds: 1) If A, BET then An BET and AUBET and 2) {0, X} CT. (a) Prove that 2X is a topology on X and so is {0, X}. (b) Prove...

The balance sheet is sometimes called the: income satement statement of financial position statement of retained eamings stalement of cash flows

Compared with half a century ago, adoption has become _ _ _ _ _ _ _ _ _ common, but it is more open and acceptabl e , so we probably discuss it _ _ _ _ _ _ _ . fill in the blanks more or much less or...

LO5 List three workplace health issues and highlight how employers are responding to them.

LO6 Define workplace security concerns and discuss some elements of an effective security program.

3. Companies are introducing more wellness programs to decrease the costs of health care, especially in light of Patient Protection and Affordable Care Act requirements. Employers are becoming more...