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.
According to the Bureau of Labor Statistics, computer hardware engineers brought home an average of $49.99 an hour in 2012, and earned an average salary of $103,980 per year. Hardware engineers employed by software publishers earned more than those in any other industry, an average of $55.73 per hour.Average hourly pay by state ranged from a low of $36 in Oklahoma to a high of $55.95 in Michigan.oftware Applications Developers. Applications developers are software engineers who design games and other programs. According to the BLS, they tended to earn slightly less than hardware and systems software engineers: an average of $44.85 an hour and $93,280 a year as of 2012.