Final 2012 Winter
4. SQL Server answer is wrong

Final 2013 Autumn
3. b. If B is A mod 2, then when A = 5, 6, 7, 8, B = 1, 0, 1, 0. In the solution, B = 0, 1, 0, 1

Midterm 2015 Winter
4. a. Stores(sid, _, _) is not necessary
4. d. Answer should be 
∃a, s, c, g1, g2, n1, n2. Stores(s, n, c) ∧
(∀b1, b2. Catalog(s, b1) ∧ Catalog(s, b2) ->  Books(b1, n1, a, g1) ∧ Books(b2, n2, a, g2))

Final 2016 Autumn
3. a. Serial schedule is T1, T3, T2.

Midterm 2016 Winter
3. e. Correct answer should be (a).

Final 2017 Autumn
5. a. Bad question, incorrect solution, real answer needss knowledge of self reference constraints