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.
This was higher than the mean wages for applications engineers and for programmers. Most system software engineers worked for computer systems design to earn $47.66 per hour or $99,140 per year. Their highest wages were in other schools, such as foreign language institutes.