Programming on IBM i: sources, ILE, RPG and SQL
How software is written, compiled and kept alive here. For anyone arriving from other languages, and for anyone who has never read the reasons written down.
SQLCODE -305: the FETCH that stops on NULLs
Eighty-two COALESCEs are not the answer. What is left in the variables when a FETCH meets a NULL, and why ALWNULL has nothing to do with it.
Administering an IBM i: how the system works
How an IBM i is put together and why: objects, libraries, jobs, subsystems, security, spool, backups. For anyone handed the machine without having seen one.