How do the concepts of balancing and leveling affect the process of creating a data model of a system? thanks

A new sales ordering system needs a relational database that contains a customer table, a product inventory table, and an order table. Use a word-processing, graphics, or spread-sheet program to draw an entity-relationship diagram showing the relationships among these entities. Next, design each of these tables showing the keys and attributes to be included in each table. Include five sample records for each table.

In the hierarchy of data, what is the difference between a data attribute and a data item? What is the domain of an attribute?

A new sales ordering system needs a relational database that contains a customer table, a product inventory table, and an order table. Use a word-processing, graphics, or spreadsheet program to draw an entity-relationship diagram showing the relationships among these entities. Next, design each of these tables showing the keys and attributes to be included in each table. Include five sample records for each table.

Data modelling is most often accomplished through the use of a(an) ________________. a. entity-relationship diagram b. data-flow diagram c. functional decomposition diagram d. activity diagram

Data modeling is most often accomplished through the use of a(n) __________________. a. entity-relationship diagram b. data-flow diagram c. functional decomposition diagram d. activity diagram

The ______________ model is a simple but highly useful way to organize data into collections of two-dimensional tables called relations.

Using a graphics program, develop an entity-relationship diagram for a database application for an Internet bookstore where students buy textbooks from a salesperson and receive invoices for their purchases. Use Figure 5.5 as a guide.

For a business of your choice, use a graphics program to develop a data-flow diagram of one of its main processes and an entity-relationship diagram showing the data within the scope of the system.

Suppose you are working within the framework of the conceptual model in Figure Q4.5. FIGURE Q4.5 THE CONCEPTUAL MODEL FOR QUESTION 5