I would absolutely pay, through the nose, for a good treatise on more advanced SQL techniques like (recursive) CTEs. And also, I would contribute in depth Drup

I would absolutely pay, through the nose, for a good treatise on more advanced SQL techniques like (recursive) CTEs. And also, I would contribute in depth Drupal topics, I already wrote two chapters of Bookzilla (aka. The Definitive Guide to Drupal 7) and also wrote countless articles in the nineties, I've been a columnist later an editor of the biggest computer monthly in Hungary.