What is a unique identifier of an entity type? Is it possible for there to be more

Question:

What is a unique identifier of an entity type? Is it possible for there to be more than one unique identifier for an entity type?

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For book-img-for-question

Data Modeling and Database Design

ISBN: 978-1285085258

2nd edition

Authors: Narayan S. Umanath, Richard W. Scammel

See More Books

Question Posted: Apr 21, 2016 06:24 AM

See More Questions

A process on host 1 has been assigned port p, and a process on host 2 has been assigned port q. Is it possible for there to be two or more TCP connections between these two ports at the same time?
In the three-tiered database architecture, is it possible for there to be no database on a particular tier? If not, why? If yes, give an example.
This exercise is based on the three Presentation Layer ER diagrams that follow. a. Describe what is reflected by the entity types and relationship types in Presentation Layer ER diagram number 1. In...
Define change management and its significance in organizations. Discuss the challenges faced during the process of organizational change and strategies to overcome resistance.
The following transactions pertain to the operations of Blair Company for 2013: 1. Acquired $30,000 cash from the issue of common stock. 2. Performed services for $12,000 cash. 3. Paid a $7,200 cash...
What are the three basic steps involved in settling a case? How can the paralegal assist the lawyer with each of these steps?
Newcastle Sporting Goods distributes merchandise to sporting goods stores. All sales are on credit, so virtually all cash receipts arrive in the mail. William Borrows, the company president, has just...
The City of Columbia is trying to attract a new manufacturing business to the area. It has offered to install and operate a water pumping plant to provide service to the proposed plant site. This...
Carlos is the controller for Rooney Corporation (a C-corp). Carlos owns a 20% interest in Rooney. He receives a salary of $60,000 and medical insurance from a qualified plan costing $6,000. Rooney's...
h) I proceed to study the short-run dynamic of the changes in gold price (LGPRICE) and inflation (INF) and estimated a VAR model. Write down the VAR(1) model using the notation LGPRICE and INF? (j)...
Distinguish between a simple attribute, a single-valued attribute, a composite attribute, a multi-valued attribute, and a complex attribute. Develop an example similar to Figure 2.3 that illustrates...
Consider the EMPLOYEE entity type given below. a. List all key and non-key attributes. b. What is (are) the unique identifier(s)? c. Which attribute(s) is (are) derived attributes? d. Using the...
Environmental Corporation specializes in the production and sale of ecofriendly packaging. In 2020, Environmental reported net income (earnings) in excess of analyst expectations. This included a...
A certain random process $U(t)$ takes on equally probable values +1 or 0 with changes occurring randomly in time. The probability that $n$ changes occur in time $\tau$ is known to be \[...
The focal points of the two converging lenses shown in Figure P33.121 are denoted by solid dots for the left lens and open dots for the right lens. Draw a simplified ray diagram to locate the final...
Suppose that country A has 9,000 worker hours available for production and that it initially has the technology given by case 3 of Exercise 1. Derive its PPF and determine its exact dimensions. data...
The table shows experimental values of the variables x and y. The variables are known to be related by the equation y = a e nx where a and n are constants. a. Draw the graph of ln y against x. b....
Construct the Nyquist diagram for a single-degree-of-freedom system with hysteretic damping.
Find all real solutions to 6x 5 + 192 = 0.
Charles owns an office building and land that are used in his trade or business. The office building and land were acquired in 1978 for $800,000 and $100,000, respectively. During the current year,...
Show that it is possible to ensure that a dependency-preserving decomposition into 3NF is a loss less-join decomposition by guaranteeing that at least one schema contains a candidate key for the...
List the three design goals for relational databases, and explain why each is desirable.
Give a loss less-join decomposition into BCNF of schema R of Exercise 7.2.
How do warehouses and distribution centers differ? What is cross-docking and why might a company choose to cross-dock a product? What kinds of products can be delivered electronically? What kinds...
Strawberry Inc. has historically been an all-equity firm. The analyst expects EBIT to be $1.5B in perpetuity starting one year from now. The cost of equity for the company is 11.5% and the tax rate...
Guzman company received a 60- day, 5 % note for 54,000 dated July 12 from a customer on account. Determine the due date on note. Determine the maturity value of the note and journalize the entry of...

What is a unique identifier of an entity type? Is it possible for there to be more

Question:

Step by Step Answer:

An attribute atomic ie simple or composite ...View the full answer

Data Modeling and Database Design

Students also viewed these Computer Sciences questions