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;