CSI104

What is definition of databases?

• a collection of related, logically coherent, data used by the application programs in an organization

• the physical computer system that allows access to data

• the actual program that allows users to access, maintain, and update data

How many components in a databases management systems?

• 4

• 3

• 5

• 6

In the hierarchical model, data is organized as an inverted tree. Each entity has only one parent but can have several children

• True

• False

Name of three main databases models in this chapter

• Vietnam Next Top models

• Hierarchical database model

• Relational database model

• Network database model

In a relational database we can define several operations to create new relations based on existing ones.How many operations in this section

• 8

• 9

• 10

• 7

SQL is

• declarative language

• procedural language

Insert is

• unary operation

• binary operation

• is not an operation

What is the first step in database design

• interviewing potential users

• build an ERM

• create a relation (table)

IN ERM, we use Rectangles for

• represent entity sets

• represent attributes

• represent relationship sets