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.
The average computer software engineer salary is $107,840 per year. Computer hardware engineer research, develop and test hardware or computer equipment including chip-set, mainboardâ¦ etc. They ensure that their hardware work properly with the latest software technology. The average computer hardware engineer salary is $112,760 per year.