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NEW QUESTION: 1
Which of the following would not correspond to the number of primary keys values found in a table in a relational database?
B. Number of rows
D. Number of tuples
The degree of a table represents the number of columns in a table.
All other elements represent the number of rows, or records, thus the number of unique primary
keys values within the table.
NOTE FROM DAN:
You can have multiple columns that in aggregate make up the Primary Key, but you only have one
The first type of key we'll discuss is the primary key. Every database table should have one or
more columns designated as the primary key. The value this key holds should be unique for each
record in the database. For example, assume we have a table called Employees that contains
personnel information for every employee in our firm. We'd need to select an appropriate primary
key that would uniquely identify each employee. Your first thought might be to use the employee's
This wouldn't work out very well because it's conceivable that you'd hire two employees with the
same name. A better choice might be to use a unique employee ID number that you assign to
each employee when they're hired. Some organizations choose to use Social Security Numbers
(or similar government identifiers) for this task because each employee already has one and
they're guaranteed to be unique. However, the use of Social Security Numbers for this purpose is
highly controversial due to privacy concerns. (If you work for a government organization, the use
of a Social Security Number may even be illegal under the Privacy Act of 1974.) For this reason,
most organizations have shifted to the use of unique identifiers (employee ID, student ID, etc.) that
don't share these privacy concerns.
Once you decide upon a primary key and set it up in the database, the database management system will enforce the uniqueness of the key. If you try to insert a record into a table with a primary key that duplicates an existing record, the insert will fail.
Most databases are also capable of generating their own primary keys. Microsoft Access, for example, may be configured to use the AutoNumber data type to assign a unique ID to each record in the table. While effective, this is a bad design practice because it leaves you with a meaningless value in each record in the table. Why not use that space to store something useful? Foreign Keys The other type of key that we'll discuss in this course is the foreign key. These keys are used to create relationships between tables. Natural relationships exist between tables in most database structures. Returning to our employees database, let's imagine that we wanted to add a table containing departmental information to the database. This new table might be called Departments and would contain a large amount of information about the department as a whole. We'd also want to include information about the employees in the department, but it would be redundant to have the same information in two tables (Employees and Departments). Instead, we can create a relationship between the two tables.
Let's assume that the Departments table uses the Department Name column as the primary key. To create a relationship between the two tables, we add a new column to the Employees table called Department. We then fill in the name of the department to which each employee belongs. We also inform the database management system that the Department column in the Employees table is a foreign key that references the Departments table. The database will then enforce referential integrity by ensuring that all of the values in the Departments column of the Employees table have corresponding entries in the Departments table.
Note that there is no uniqueness constraint for a foreign key. We may (and most likely do!) have more than one employee belonging to a single department. Similarly, there's no requirement that an entry in the Departments table have any corresponding entry in the Employees table. It is possible that we'd have a department with no employees.
Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 2: Access Control Systems (page 45). also see: http://databases.about.com/od/specificproducts/a/keys.htm
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