设有一个学生选课数据库，其包括学生表S、课程表C和学生选课表SC三个关系：S（SNO, SNAME, SAGE, SDEP）;C（CNO, CNAME）;SC（SNO, CNO, GRADE）。其中SNO是学生号，SNAME是学生姓名，SAGE是年龄， SDEP是学生所在系，CNO是课程号，CNAME是课程名称。 “查询计算机科学系年龄介于15岁至19岁之间的学生”，其SQL语句为（）。

A.SELECT * FROM S WHERE SDEP = ‘CS’ AND SAGE BETWEEN 15 AND 19;

B.SELECT * FROM S WHERE SDEP = ‘CS’ AND SAGE <= 19 AND SAGE >= 15;

C.SELECT * FROM S WHERE SDEP = ‘CS’ OR SAGE BETWEEN 15 AND 19;

D.SELECT * FROM S WHERE SDEP = ‘CS’ AND SAGE <= 19 OR SAGE >= 15;

正确答案：SELECT * FROM S WHERE SDEP = ‘CS’ AND SAGE BETWEEN 15 AND 19;；SELECT * FROM S WHERE SDEP = ‘CS’ AND SAGE <= 19 AND SAGE >= 15;