I found this first SQL Seminar to be simply expressed and "approachable" (I was expecting it to be more complicated).
I really like the "bite-sized lessons. They make it possible to concentrate fully and get maximum benefit from the lesson. They also make it possible to remember better, not to be interrupted, to pick up again without any "mess".
I wasn't sure whether I wanted to learn SQL or not (I'm retired and doing this for pure personal interest - no obligations, nobody asking me have I done it...) but I've bought the second seminar and I'm well on in it and I imagine that, in time, I'll be getting the third one too.