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 engineering has two major specialties: Computer software engineer and computer hardware engineer. Computer software engineer develop, design and test software or construct, maintain computer networks, programs for companies. They create computer interfaces, operating systems, new programs and applications such as desktops, smartphones, tablets. The average computer software engineer salary is $107,840 per year.