31. The following query will execute without errors: select customer.customer_name, salesman.sales_quota from customer where customer.salesman_id = (select salesman_id from salesman where lname = ‘SMITH’); a.TRUE b.FALSE 32. Table TT {J , D , C , V , N , G } and a set of functional dependencies J,C,N → V,G D → C,V,G J → D,C,G The closure of {D } is: Giáo Trình Cơ Sở Dữ Liệu Trang 102 Biên soạn : Phan Tấn Quốc- Trường Cao Đẳng Kỹ Thuật Cao Thắng a) J D C V N G b) J D C V G c) J C V G d) D C V N e) D C V G 33. Table TT {O , M , Z , I , Q } and a set of functional dependencies O → I,Q I → M,Z O,Z → M Table TT is: a) 1 NF b) 2 NF c) 3 NF 34. For which task in SQL would you use an IN clause (a) To query the database for unknown values (b) To query the database for a range of values (c) To query the database for a character pattern (d) To query the database for values in a specified list 35. A Cartesian product is (a) A group function (b) Produced as a result of a join select statement with no where clause (c) The result of fuzzy logic (d) A special feature of Oracle Server 36. A type of query that is placed within a WHERE or HAVING clause of another query is called a: (a) master query. (b) subquery. (c) superquery. (d) multi-query. 37. In order to perform a join, which criteria must be true? Giáo Trình Cơ Sở Dữ Liệu Trang 103 Biên soạn : Phan Tấn Quốc- Trường Cao Đẳng Kỹ Thuật Cao Thắng (a) The two tables must have the exact same columns. (b) The tables in the join need to have common rows. (c) The two tables must both have primary keys (d) The two tables must have at least one common column. 38. An attribute(s) which uniquely determines a tuple within a relation is called a: (a) Candidate key (b) Foreign key (c) Primary key (d) All of the above (e) A and C 39. Table Q(A,B,C) and a set of functional dependencies AB → C; C → A; Table Q is: a) 1 NF b) 2 NF c) 3 NF d) BCNF 40. Table Q(A,B,C,D) and a set of functional dependencies AB → C; D → B; C → AD Table Q is: a) 1 NF e) 2 NF f) 3 NF g) BCNF 41. The following table and functional dependencies exhibits what type of dependency? Table(A, B, C) A -> C A -> B B -> C (a) Partial Dependence (b) Transitive Dependence (c) Full Dependence (d) A and B (e) None of the above . → C,V,G J → D,C,G The closure of {D } is: Giáo Trình Cơ Sở Dữ Liệu Trang 102 Biên soạn : Phan Tấn Quốc- Trường Cao Đẳng Kỹ Thuật Cao Thắng a) J D C V N G b) J D C V G c) J C V G d) D C. perform a join, which criteria must be true? Giáo Trình Cơ Sở Dữ Liệu Trang 103 Biên soạn : Phan Tấn Quốc- Trường Cao Đẳng Kỹ Thuật Cao Thắng (a) The two tables must have the exact same columns Oracle Server 36. A type of query that is placed within a WHERE or HAVING clause of another query is called a: (a) master query. (b) subquery. (c) superquery. (d) multi-query. 37. In