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)
举一反三
- 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
- 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
- 统计选修了a001课程的学生的平均成绩( ) A: select cid,avg(grade) from student group by cid having cid=’a001’ B: select cid,avg(grade) from student where cid=’a001’ group by cid C: select cid,avg(grade) from course where cid=’a001’ group by cid D: select cid,avg(grade) from sc where cid=’a001’ group by cid
- 表sc中存放了多个学生的多门课程的成绩，sno为学号，cno为课程号，grade为成绩。要查询平均分最高的学生学号和平均分，下列（）语句可以实现。 A: SELECT top 1 sno,avg(grade) FROM sc group by sno order by avg(grade) desc B: SELECT sno,max(avg(grade)) FROM sc group by sno C: SELECT sno,max(grade), avg(grade) FROM sc group by sno D: SELECT sno,max(grade) FROM sc group by sno
- 设关系模式SCG (S#, C#, grade)中S#为学生学号，C#为课程号，grade为某学号学生学某号课程的考试成绩。今要查询每门课程的平均成绩，且要求查询的结果按平均成绩升序排列，平均成绩相同时，按课程号降序排列，则用SQL查询语言应为 (1) 。 若查询的结果仅限于平均分数超过80分的，则应 (2) 。 (1) A: Select C#，AVG(grade) From SCG Group by grade Order by 2，C# Desc B: Select C#，AVG(grade) From SCG Group by C# Order by 2，C# Desc C: Select C#，AVG(grade) From SCG Where C#，AVG Desc Group by grade D: Select C#，AVG(grade) From SCG Group by AVG(grade) Order by 2，C# Desc
内容
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在学生选课数据库中，查询平均成绩大于等于60分的同学，SQL语句为（ ） A: SELECT Sno, AVG(Grade) FROM SC GROUP BY Sno HAVING AVG(Grade)>=60; B: SELECT Sno FROM SC WHERE Grade>=60 GROUP BY Sno; C: SELECT Sno, Grade FROM SC GROUP BY Sno HAVING AVG(Grade)>=60; D: SELECT Sno FROM SC GROUP BY Sno HAVING Grade >=60;
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查询最低成绩大于85分的学生学号和平均成绩,可以使用的查询语句是: 。 A: SELECT Sno, AVG(Grade) FROM SC HAVING MIN(Grade) > 85 GROUP BY Sno; B: SELECT Sno, AVG(Grade) FROM SC GROUP BY Sno HAVING MIN(Grade) > 85; C: SELECT Sno, AVG(Grade) FROM SC WHERE MIN(Grade) > 85 GROUP BY Sno; D: SELECT Sno, AVG(Grade) FROM SC GROUP BY Sno WHERE MIN(Grade) > 85;
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在学生选课数据库中，查询平均成绩大于等于60分的同学，SQL语句为（ ） A: SELECT Sno, AVG(Grade) FROM SC GROUP BY Sno HAVING AVG(Grade)>=60; B: SELECT Sno FROM SC WHERE Grade>=60 GROUP BY Sno; C: SELECT Sno, Grade FROM SC GROUP BY Sno HAVING AVG(Grade)>=60; D: SELECT Sno FROM SC GROUP BY Sno HAVING Grade >=60;
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命令Select S_No,Avg(Grade)As ‘平均成绩’ From Score Group By S_No Having Avg(Grade)>=85,表示
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设关系模式SCG (S#, C#, grade)中S#为学生学号，C#为课程号，grade为某学号学生学某号课程的考试成绩。今要查询每门课程的平均成绩，且要求查询的结果按平均成绩升序排列，平均成绩相同时，按课程号降序排列，则用SQL查询语言应为 (1) 。 若查询的结果仅限于平均分数超过80分的，则应 (2) 。 (1) A: Select C#，AVG(grad From SCG Group by grade Order by 2，C# Desc B: Select C#，AVG(grad From SCG Group by C# Order by 2，C# Desc C: Select C#，AVG(grad From SCG Where C#，AVG Desc Group by grade D: Select C#，AVG(grad From SCG Group by AVG(grad Order by 2，C# Desc