I wrote that ...

Also, when I read from database, I tend to make my selects as simple as possible. I do not use joins on joins on joins on joins. I prefer reading multiple different tables as quick as possible, and then process the data outside the database. But I use max, avg, min and sum a lot. I use simple things a lot and complicated things as little as possible.

Max, min, avg and sum... those I take as simple things. but complicated things for me are queries in queries in queries, joins, etc.