Database Primary Key: A primary key is a combination of one or more column values in a table that make a row of data unique within a database table. Identification of primary keys is an important part of entity type identification. Ideally, primary keys should be. stable and.
It depends on their experience, the industry of their clients, what their special â¦ ty is, their location, etc., etc.According to the U.S. Department of Labor, the 2002 median annual earnings of salaried computer programmers was $60,290.
There are several popular fields that computer hardware engineers work in and the salary of the computer hardware engineer may vary according to the specific field. The median annual salary for a computer hardware engineer who works in computer and information technology services is $77,000. The annual salary for a computer hardware engineer is slightly higher at about $83,000 if he or she works in the computer and office equipment field.