【单选题】5. 假定student表中有字段grade,grade代表分数,依次统计grade字段的最大值,最小值,平均值的SQL语句是
A. SELECT max(grade),min(grade),average(grade) FROM student; B. SELECT max(grade),min(grade),avg(grade) FROM student; C. SELECT min(grade),average(grade),max(grade) FROM student; D. SELECT min(grade),avg(grade),max(grade) FROM student;
A. SELECT max(grade),min(grade),average(grade) FROM student; B. SELECT max(grade),min(grade),avg(grade) FROM student; C. SELECT min(grade),average(grade),max(grade) FROM student; D. SELECT min(grade),avg(grade),max(grade) FROM student;
举一反三
- 统计学生成绩中的最高分，下列语句正确的是 A: SELECT AVG(grade) FROM student; B: SELECT (SUM(grade) / Count(id)) FROM student; C: SELECT MAX(grade) FROM student; D: SELECT MIN(grade) FROM student;
- 针对表SC（sno, cno, grade），其中sno为学号，cno为课程号，grade为成绩。以下哪个操作（ ）统计出每位学生所选课程的最高分和最低分。 A: select sno,max(grade), min(grade) from sc B: select sno,max(grade), min(grade) from sc order by sno C: select sno,max(grade), min(grade) from sc group by sno D: select sno,avg(grade), sum(grade) from sc group by sno
- 按照课程号进行分组，统计学生平均成绩大于60分的学生的信息( ) A: select cid,avg(grade) from sc group by cid having avg(grade)>60 B: select cid,avg(grade) from student group by cid having avg(grade)>60 C: select cid,avg(grade) from course where avg(grade)>60 group by cid D: select cid,avg(grade) from student where avg(grade)>60 group by cid
- 按照学号进行分组，统计学生的平均成绩，且平均分按降序排列 A: select sid, avg(grade) from sc group by sid order by avg(grade) desc B: select sid, avg(grade) from sc group by cid order by avg(grade) desc C: select sid, avg(grade) from student group by sid order by avg(grade) desc D: select sid, avg(grade) from student group by cid order by avg(grade)
- 按照学号进行分组，统计学生的平均成绩（） A: select sid, avg(grade) from student group by cid B: select sid, avg(grade) from student group by sid C: select sid, avg(grade) from sc group by sid D: select sid, avg(grade) from sc group by cid