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;

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