There is a good introductory course at Coursera, taught by Professor Jennifer Widom. I liked it, not only because of the contents and the format (which are good

There is a good introductory course at Coursera, taught by Professor Jennifer Widom. I liked it, not only because of the contents and the format (which are good, and work for me), but because of how intensely enthusiastic the Dr Widom was. A++, would take a course taught by her again.