• Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

3. Implementing Entity-Relationship Mode... > 3.1. Implementing Entities

Implementing Entities

As discussed in the previous chapter, an entity is implemented (or described in concrete terms) simply by giving the values of its attributes. Thus, the following is an implementation of a Books entity:

Title = Gone With the Wind
ISBN = 0-12-345678-9
Price = $24.00

Implementing Entity Classes—Table Schemes

Since the entities in an entity class are implemented by giving their attribute values, it makes sense to implement an entity class by the set of attribute names. For instance, the Books entity class can be identified with the set:

{ISBN,Title,Price}

(We will add the PubID attribute name later, when we implement the relationships.)


PREVIEW

                                                                          

Not a subscriber?

Start A Free Trial


  
  • Creative Edge
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint