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.
Computer hardware engineers who work in telecommunications or the electrical components field can expect about $72,000 per year. These salaries will vary depending on the economic conditions during the time of employment. Because there is a high demand for computer hardware engineers, there is also plenty of competition for the available jobs. Times of economic prosperity bring more work as well as better paying work. Consequently, the demand for an experienced computer hardware engineer is higher and he or she can expect to start at a high salary and receive pay raises.