Convert the following relational schema into an Entity relationship diagram. Person (numpers, age, gender, numCat) Category (numCat, Title) Opinion (numO, answer, numPers, num) Question (numQ, Description)

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

What is a relation?

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.