Duplicate of Databases 1

Question 1

How can you uniquely identify every instances of an entity in a E-R Diagram?

Accepted Answer

By having a unique identifier as an attribute

Question 2

The basic components of a Entity-Relationship Model include:

Accepted Answer

Entity types, attributes, relationship types

Question 3

A relationship can have attributes

Accepted Answer

TRUE

Question 4

Recursive relationships is a relationships between an entity and itself.

Accepted Answer

TRUE

Question 5

Attributes are represented by ovals.

Accepted Answer

TRUE

Question 6

What is the idea behind E-R Diagrams, that was developed By Peter Chen?

Accepted Answer

A tool for communication between designers and users.

Question 7

One important aspect about E-R Diagrams are that it enables designers and users to express....

Accepted Answer

their understanding of what the planned db is intended to do

Question 8

The goal with the Entity Relationship Model is to

Accepted Answer

Facilitate how a database design should look like

Question 9

Cardinality describes how many entity instances can be in the relationship

Accepted Answer

TRUE

Question 10

What is an Attribute?

Accepted Answer

An attribute is the smallest piece of information in an ERD

Question 11

Entities are represented by rectangles

Accepted Answer

TRUE

Question 12

Relations are represented by rectangles

Accepted Answer

FALSE

Question 13

How can you easily identify whether something is an entity?

Accepted Answer

By searching for nouns

Questions 13