Suppose the members of a project team sketch the home page and a template for each of the four levels in the site. They then create prototypes for a single page on each level, and each page is reachable from the prototyped page one level above it. What type of prototype is this?
What will be an ideal response?
This prototype has depth and no breadth. It is a horizontal prototype.
You might also like to view...
The plus sign is used to collapse the contents of a folder
Indicate whether the statement is true or false
Answer the following questions with reference to how the ER model in Figure 17.13 maps to relational tables.
The ER diagram in Figure 17.13 shows only entities and primary key attributes. The absence of recognisable named entities or relationships is to emphasize the rule-based nature of the mapping rules described in Step 2.1 of logical database design.
(a) How many relations will represent the ER model?
(b) How many foreign primary keys are mapped to the relation representing X?
(c) Which relation(s) will have no foreign key?
(d) Using only the letter identifier for each entity, provide appropriate names for the relations mapped from the ER model.
(e) If the cardinality for each relationship is changed to one-to-one with total participation for all entities; how many relations would be derived from this version of the ER model?