Question: DATABASE SYSTEMS What is a key and how is it important in a relational model?

DATABASE SYSTEMS


What is a key and how is it important in a relational model?

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!

Q:

Do some amendment and enhance the given research paper: Table of Content Abstract..3 Action Research.4 Research Methodology and Design...5 Literature Review: NoSQL Database7 Proposal.7 Iteration 1..8...

Q:

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...

Q:

Portray in words what transforms you would have to make to your execution to some degree (a) to accomplish this and remark on the benefits and detriments of this thought.You are approached to compose...

Q:

What is a key and how is it important in a relational model?

Q:

INTERNATIONAL REVIEW OF L AW C OMPUTERS & TECHNOLOGY , VOLUME 11, N UMBER 2, P AGES 251-261, 1997 The Data Mart: A New Approach to Data Warehousing PAM ELA PIPE Introduction Vendors have recently...

Q:

Consider Hoare triples of the form {T} V := E {V = E} where T is the atomic formula 'true' and V and E range over variables and expressions, respectively. (i) Write down an instance of such a triple...

Q:

WL Question: You are given a tree T = (V, E) alongside an assigned root hub r V . The parent of any hub v 6 = r, signified p(v), is characterized to be the hub contiguous v in the way from r to v. By...

Q:

Test#1 CS488 Fall 2018 8 Acontains at least all of the attribute names and characteristics for each table in the a. data dictionary e. logical schema b. relational schema d. Database hip 9. The...

Q:

PART A: Short Answer Questions [40 marks] 1) Relation bankCustomer has 50,000 tuples, which are stored as fixed length and fixed format records; each has the length of 350 bytes. Tuples contain the...

Q:

I need help with questions 5.14,5.15,5.16,5.18. solution: https://www.chegg.com/homework-help/Database-Systems-6th-edition-chapter-5-problem-10E-solution-9780132943260 TextBook: database systems a...

Q:

Evaluate the squeeze theorem limits lim (e). sin (5) 2-10

Q:

What is the difference between understandability and relevance?

Q:

Suppose they were returns on an asset are normallyDistributed. The average annual return for the asset over some period was 6 . 6 % and the standard deviation of this asset for that period was 8 . 5...

Q:

Let Q ( x , y ) be the statement " x + y = x y ." If the domain for both variables consists of all integers, what are these truth values? y xQ ( x , y )

Q:

(24). (4x 2) 2 -2x(8x 8) (25). x 2 y 3 x 3 y 2 /x 2 y 2

Q:

use least-squares regression to fit (a) a straight line, (b) a power equation, (c) a saturation-growth-rate equation, and (d) a parabola. For (b) and (c), employ transformations to linearize the...

Q:

Regarding the conflict process, which statement is most correct? Question 1 5 Select one: a . Intentions can only be formed after conflict is perceived. b . Intentions are formed after the other...

Q:

Explain between employees and management in the commission of afraid is difficult to both prevent and detect.

Q:

What general ledger journal entries does the purchases system trigger? From which departments do these journal entries arise?

Q:

Classify the following decisions as being characteristic of strategic planning, tactical planning, managerial control, or operational control. Determining the mix of products to manufacture this year...

Q:

24. In which way do men and women differ mostintellectual performance, total gray matter, or total white matterpg105

Q:

20. Suppose someone demonstrates that a particular brain area becomes active when people are listening to music. When that area becomes active later, what, if anything, can we concludepg105

Q:

2. Examine the effects of stimulating a brain area. Ideally, if damaging some area impairs a behavior, stimulating that area should enhance the behavior.