Q:
I want any web sites or books just for training on ERD and normalization. I want a lot of sample, practices, and case studies with recommended answers, to strengthen my skill in database design and avoid the poor database designs I've made.
Note: I don't need books to explain the concepts, what I need is practices, examples, and case studies with recommended answers.
Thanks in advance.
I would consider Object Role Modelling over ERM using NORMA or some such.
There is small group on linkedin about ORM, as well a short discussion over on dbaspot.
For normalization, I'd start with Wikipedia and then search