Your SlideShare is downloading. ×
Entity Classes and AttributesEntity Class are represented by rectanglesAttributes are represented by ovalsKey attribute is...
Upcoming SlideShare
Loading in...5
×

Entity Classes and Attributes

136

Published on

Published in: Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
136
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
1
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Transcript of "Entity Classes and Attributes"

  1. 1. Entity Classes and AttributesEntity Class are represented by rectanglesAttributes are represented by ovalsKey attribute is represented by an underlineMultivalued attributes is represented with an oval with a double borderDerived attribute is represented with an oval dashed border -- Example the AGE from current -birthComposite attribute is represented with an oval that connects to additional ovalsRelationship Types and ConstraintsA relationship type is represented by a diamond and two connecting lines. The name of therelationship is shown inside the diamond. Reading the diagram from left to right to yields "a storeowns a video"..The name of the relationship type is a verb or verb phrase that describes the relationship.The alternate relationship name IsOwnedBy is the name of the relationship type when reading theother direction.

×