The supertype and subtype entities in the ER model correspond to supertables and subtables in a relational database. ... The Web site front end consists of pages that include descriptions and pictures of the products, a shopping cart, and a form for capturing ... Figure 2-14 shows an ER diagram of the Gentoo Joyce system.
|Title||:||SQL All-in-One For Dummies|
|Author||:||Allen G. Taylor|
|Publisher||:||John Wiley & Sons - 2011-03-10|