11. 下列程式正式的時間複雜度為何？ (A) O(n) (B) O(m) (C) O(nm) (D) O(n, m)

19. 假設一關聯式資料庫中有一表格名為 student，包含 name (varchar(10))、score (int)、department (varchar(10))、studentID (char(10)) 四個欄位，請問下列查詢語法何者不正確？ (A) select studentID from student; (B) select name, studentid from student where score \( < 60 \) (C) select count(*) from student group by department; (D) select avg(*) from student where department = cs;