What exactly is a global constant? Is it legal in a programme to utilise global constants?

The 'type' of a variable isn't the only thing that has to be specified when defining it. To rephrase, there are various characteristics and data types associated with each variable. Provide a detailed example of how we might use this idea to describe the characteristics of any variable.

How many levels of data abstraction does an ideal system have?

Regional Labs is a company that conducts research and development work on a contract basis for other companies and organizations. Figure 2-33 shows data that Regional Labs collects about projects and the employees assigned to them. This data is stored in a relation (table) named PROJECT: PROJECT (ProjectID, Employee Name, EmployeeSalary) ProjectID 100-A 100-A FIGURE 2-33 Sample Data for Regional Labs 100-B 200-A 200-B 200-C 200-C 200-D EmployeeName Eric Jones Donna Smith Donna Smith Eric Jones Eric Jones Eric Parks Donna Smith Eric Parks Employee Salary 64,000.00 70,000.00 70,000.00 64,000.00 64,000.00 58,000.00 70,000.00 58,000.00

What exactly is a global constant? Is it legal in a programme to utilise global constants?

There has to be a mechanism of automated scaling defined.