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.
Learning how to become a computer engineer is the first step toward earning a more-than-comfortable salary. According to the Bureau of Labor Statistics, the median income for this profession was $108,430 in 2014, but the top-earners make more than $160,000.