I don’t know SQL, but I want to write a report that does X. Can you tell me how?

The community people in the Koha IRC channel are usually happy to help write reports, but a great many reports have already been shared by the community, so there are a few places to check before you ask:

Koha Reports Library
Koha Database Schema

Help with custom report parameters:
Koha Manual – SQL Reports (scroll down to section 1.1.2)

Posted in: Reports