I've just found an online Animated DataBase Courseware offering an "Interactive Approach for Teaching the Principles of DataBase Concepts", including topics like database design (ER notation, transformation rules for deriving database schemas from ER models, normalizations and functional dependencies concepts,...), sql, transactions and security.

All this is complemented with proposals of exercises (solution is provided) and completely free.

For instance, this month's challenge is: Without the use of a cursor, write a stored procedure that accepts a total sale amount, tax rate, and total number of payments; then inserts required payment schedule records (id, pre tax payment amount, tax amount, total amount). Any remainder should be evenly split among all payment amounts, with the final payment amount reduced accordingly.

Participants may win a small prize and in exchange the company gets some visibility.