For the last 15 years of my professional programming career, I've worked with Fortune 100 companies either designing/implementing, or cleaning up/optimizing backend solutions.

Nearly 100% of that is the aggregation or calculation of data used in intranet webapps. About half of my work is optimizing sql queries for efficiency, 25% fixing other people's issues and 25% actually writing code (perl, psql and ... sigh ... php).