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.
In 2014, the U.S. Bureau of Labor Statistics (BLS) reported a median salary of about $108,430 for computer hardware engineers. Most computer engineers earned between $66,070 and $160,610.ompared to a computer engineer, a systems software developer averaged roughly the same salary (around $100,000), and an applications software developer makes slightly less (about $92,000).