Database Tutorials 
I have just found a pair of really good Database tutorials. They don’t teach SQL - what they teach is Database design (Data Modeling and Relational Modeling)… ERD’s, referential and entity integrity, normalization. All the good stuff. Now I haven’t read both of them in their entirty… skimmed over parts that I already knew, but read parts that I haven’t used/remembered. There were a few parts that I was taught using slightly different terminology… but I quickly realized/recognised them.
I had completely forgotten about super and subtype heirachies, domains, and the term tuple. The INSERT and DELETE integrety rules was a very clear and concise refresher, and the review of data manipulations using set theory definately made me sit up and get the brain thinking (need to go back again and reread it)… I also found a few things I had never heard of - 4th and 5th normal forms for example.
Definately need to remember this site - I’m sure others will want to look it over and learn… and I’m sure I will point others there to learn a few things.