vnz 0233 databases demystified - a self-teaching guide (2004)
Tài liệu McGraw-Hill - Databases A Beginner_s Guide (2009)01 pptx
... I’ve heard the term “data bank” used. What is the difference between a data bank and
a database?
A:
A data bank and a database are the same thing. Data bank is merely an older term that was
used ... Layer
Database
File
Database
File
Database
File
Database
File
Database
File
Figure 1-1 Database layers of abstraction
Chapter 1: Database Fundamentals
5
make a distinction? A n...
Microeconomics Demystified: A Self-Teaching Guide docx
... both specialize in their
comparative advantage, the amount of soda and pizza available to both of them is
greater than if they each produced both soda and pizza. If Sandy and Robinson
agree on ... Robinson and Sandy can produce 50 pizzas and
30 sodas and can split this combination of pizza and sodas in a mutually benefi cial
way so that each of them can consume more pizza and soda than...
Microeconomics Demystified: A Self-Teaching Guide pot
... on a diet that is either all corn silage or
predominately a concentrate of corn grain and alfalfa pellets than on a diet that is half silage and half concentrate
(Bhide et al. 1984). However, any ... What happens to the demand for baseball bats?
8. Suppose some raptors escape from Jurassic Park, multiply in the wild, and eat a large
number of goats and chickens on nearby farms.
a. Wh...
Thermodynamics demystified a self teaching guide
... causes a
change in phase of the working substance.
EXAMPLE 4.11
Steam enters a throttling valve at 8000 kPa and 300°C and leaves at a pressure
of 2000 kPa. Determine the fi nal temperature and ... Thermodynamics
Demystifi ed
4
Thermodynamics Demystifi ed
1.3 Properties and State of a System
The matter in a system may exist in several phases: a solid, a liquid, or a gas....
Databases Demystified a self teaching guide phần 1 doc
... Database Design Using
Normalization 14 5
The Need for Normalization 14 7
Insert Anomaly 14 8
Delete Anomaly 14 8
Update Anomaly 14 8
Applying the Normalization Process 14 8
Choosing a Primary Key 15 1
First ... databases,
including properties common to databases, prevalent database models, a brief his
-
tory of databases, and the rationale for focusing on the relational model....
Databases Demystified a self teaching guide phần 2 pot
... screen
CHAPTER 2 Exploring Relational Database Components
33
Demystified / Databases Demystified / Oppel/ 22 5364-9 / Chapter 2
Logical/Physical Database
Design Components
The logical database design ... Deleting database objects
c. Adding new database objects
d. Adding data items to existing database objects
e. Deleting data items from existing database objects
CHAPTER 1 Database...
Databases Demystified a self teaching guide phần 3 potx
... row are called aggregate functions. The following table shows
aggregate functions that are commonly used in relational databases:
Function Name Description
AVG Calculates the average value for a ... printer profile
Composite Default screen
78
Databases Demystified
Demystified / Databases Demystified / Oppel/ 22 536 4-9 / Chapter 3
beauty of relational databases is that we nee...
Databases Demystified a self teaching guide phần 4 ppsx
... that ends every SQL statement.
In Oracle, a transaction is automatically started for each database user session as soon
as the user connects to the database. At any time, the database user can ... table’s data.
The ALTER TABLE Statement
The ALTER TABLE statement may be used to change many aspects of the definition
of a database table. Again, there is a wide variation in implementation a...
Databases Demystified a self teaching guide phần 5 pot
... redundant data in tables
ã
Storing summarized data in tables
Note also that normalization is intended to remove anomalies from databases that
are used for online transaction-processing systems. Databases ... Databases that store historical
data used solely for analytical purposes are not as subject to insert, update, and de
-
lete anomalies. Chapter 12 contains more information on data...
Databases Demystified a self teaching guide phần 6 ppt
... profile
Composite Default screen
194
Databases Demystified
Demystified / Databases Demystified / Oppel/ 225 364 -9 / Chapter 7
The Data Flow Diagram
The data flow diagram (DFD) is the most data centric of all ... privileges.
6. The update anomaly refers to a situation where:
a. A simple update requires updates to multiple rows of data.
b. Data cannot be updated because it does...
Databases Demystified a self teaching guide phần 7 docx
... considered
a best practice because it can lead to a lack of data sharing. Moreover, placing
geographic or organizational unit names in table names plays havoc every
time the organization changes.
CHAPTER ... synchronizing data updates for
any redundantly stored data
ã
More expensive than the centralized model
ã
Lack of guidelines and best practices for how to partition data and
applicatio...
Databases Demystified a self teaching guide phần 8 pdf
... even to a different version of the same vendor’s database).
Connecting Databases to Java Applications
Java started as a proprietary programming language (originally named Oak) that was
developed ... that
binds the API to the particular database and platform, and a definition known as the
ODBC data source contains the information necessary for a particular application to
connect with...
Databases Demystified a self teaching guide phần 9 docx
... Default screen
CHAPTER 12 Databases for Online Analytical Processing
301
Demystified / Databases Demystified / Oppel/ 225364 -9 / Chapter 12
Data Marts
A data mart is a subset of a data warehouse ... contains more data than a data warehouse.
e. The project has a lower overall cost than a data warehouse project.
16. Building a data warehouse first, followed by data mart...
Databases Demystified a self teaching guide phần 10 pps
... letter A in the acronym ACID stands for:
a. Automated
b. Abbreviated
c. Atomicity
d. Autonomous
e. Analog
82. Database locks:
a. Are implemented in exactly the same way by all major database vendors
b. ... 261
models, database, 2
modules, 55
MOLAP databases, 299–301
msdb database, 261
multidimensional OLAP databases, 299–301
multiple joins, 77–80
multivalued attributes, 150
N
namespace,...
vnz 0233 databases demystified - a self-teaching guide (2004)
... databases, prevalent database models, a brief his
-
tory of databases, and the rationale for focusing on the relational model.
Properties of a Database
A database is a collection of interrelated ... Access places the
entire database in a single data file, so an Access database can be defined as the file
that contains the data items. Oracle Corporation defines their database as...
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