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 lowest paid 10 percent of computer hardware engineers earned $62,400 or less, while the very highest paid 10 percent made $147,610 or more annually. The bureau reports that the average salary for computer hardware engineers was $101,360 per year.