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.
Pay Scale and Average Salary. The Bureau of Labor Statistics reports that half of all computer hardware engineers in the United States earned between $77,630 and $122,700 per year as of May 2011, with a median salary of $98,610 for the occupation.