Databases Reference
In-Depth Information
Figure 2-7
Product
Number
Product
Name
Unit
Price
Image
16386
Wrench
12.95
19440
Hammer
17.50
21765
Drill
92.99
Saw
24013
26.25
26722
Pliers
11.50
Object-relational database table.
database, is shown in Figure 2-7. Notice in this example that the data includes
large-object image data.
It is now common to see the
Unified Modeling Language (UML)
used
when creating data models for relational database management system (RDBMS)
based applications. UML was developed in 1997 specifically as the modeling lan-
guage to describe data models for object-oriented database systems.
SELF-CHECK
•
Describe the basic database models.
•
Explain why the relational and object-relational models are the most
commonly used database models in current database applications.
•
Compare how relationships between data entities are represented in
the hierarchical, network, and relational models.
