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.
Most computer hardware engineers make somewhere between $54,000 and $148,000 per year. An entry-level computer hardware engineer with a bachelor's degree in Computer Engineering will start out at a salary between $55,000 and $60,000. Over time a computer hardware engineer can expect to see a salary raise with the more professional experience that he or she obtains.