Construction and Management
1. What is a database?
A database is one or more large structured sets of persistent data, usually associated with
software (database management system) to update and query the data. A simple database
might be a single file containing many records, each of which contains the same...
Many books and articles just provide a definition of each modeling component and give examples of pre-built ER diagrams. Beginners in data modeling have a great deal of difficulty learning how to approach a given problem, what questions to ask in order to build a model, what rules to use while constructing...
Systems Analysis and Design
1 What is Information?
1. Knowledge derived from study, experience or instruction.
2. Knowledge of specific events or situations that has been gathered or received by communication; intelligence of news...
startup date to current date.
Primary Keys – primary keys are underlined in the E-R diagram.
Format: TABLE NAME (KEY ATTRIBUTE 1, ATTRIBUTE 2, …)
For example, the CLASS_CODE is a primary key, then
CLASS (CLASS_CODE, CRS_CODE, CLASS_SECTION, CLASS_TIME, CLASS_ROOM, PROF_NUM)
If the CLASS_CODE is deleted...
data efficiently and allowing it to persist over long periods of time, safely. These systems are among the most complex types of software available.
Thus, for our question: What is a database? In essence a database is nothing more than a collection of shared information that exists over a long period...
Windows Enterprise Support Database Services provides the following documentation about relational database design, the relational database model, and relational database software.
Introduction to Data Modeling
A brief overview of developing a conceptual data model as the first step...
information during analysis. When might one be better than another?
2. What are the general guidelines for collecting data through observing workers?
3. What is the degree of a relationship? Give an example of each of the relationship degrees illustrated in this chapter.
Please make sure...
Solution – Day 8
1. Answer the following questions.
1A. What do the acronyms SDLC and DBLC mean, and what do they portray?
SDLC = Systems Development Life Cycle (SDLC)
DBLC = Database Life Cycle
1B. What is the relationship between the SDLC and the DBLC?
for the storage of data that has the following characteristics:
The data is globally useful information in the domain that needs to be replicated to each Active Directory domain controller.
The data has well-defined object attributes and semantics.
The data has a useful life that is at least two times...
Computers & Operations Research 30 (2003) 2135 – 2155
A strategic model for supply chain design with logical constraints: formulation and solution
Hong Yan∗ , Zhenxin Yu, T.C. Edwin Cheng
Department of Management, The Hong Kong Polytechnic University, Kowloon, Hong...
schema today really consists of two separate schemas: a logical schema and a physical schema. The logical schema is the representation of data for a type of data management technology. The physical schema describes how data are to be represented and stored in secondary storage using a particular DBMS...
function from what is there in requirement.
Eg. If the user cannot search one or more product among all the products then it is a defect.
Bug: is referred as A fault in a program which causes the program to perform in an unintended or unanticipated manner.
Test Case: is a description of what to be tested...
A) several limitations of traditional file processing systems that are
* Separation and isolation of data
* Each program maintains its own set of data.
* Users of one program may be unaware of potentially useful data held by other programs.
* Duplication of data
years. —V.R. To Anne-Louise, for her loving support, encouragement, and patience. To Leila, whose laughter and joy of life continue to teach me about what is truly important. To my teachers, colleagues, and students, from whom I continue to learn every day. —H.T.
Fred R. McFadden 1933–2009
optimisation of realistic portfolios. The model is based on the classical mean-variance approach, but enhanced with floor and ceiling constraints, cardinalityconstraints and nonlinear transaction costs which include a substantial illiquidity premium, and is then applied to a large 100-stock portfolio...
QUESTIONS & ANSWERS
OBJECTIVE TYPE QUESTIONS
Each question carries 2 marks. Choose the correct or best alternative in the following: Q.1 In the relational modes, cardinality is termed as: (A) Number of tuples. (B) Number of attributes. (C) Number of tables. (D) Number of constraints. Ans: A Q.2 Relational...
Disadvantages of the traditional approach Data Security: The data as maintained in the flat file(s) is easily accessible and therefore not secure Example: Consider the Banking System. The Customer_Transaction file has details about the total available balance of all customers. A Customer wants information...
overstated. Most of the basic concepts and definitions used in the entity relationship model (ERM) were introduced in Chapter 2, Data Models. For example, the basic components of entities and relationships and their representation should now be familiar to you. This chapter goes much deeper and further...
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