sql统计-关于学生成绩
学生成绩表(stuscore):
姓名:name |
课程:subject |
分数:score |
学号:stuid |
张三 |
数学 |
89 |
1 |
张三 |
语文 |
80 |
1 |
张三 |
英语 |
70 |
1 |
李四 |
数学 |
90 |
2 |
李四 |
语文 |
70 |
2 |
李四 |
英语 |
80 |
2 |
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问题:
1. 计算每个人的总成绩并排名(要求显示字段:姓名,总成绩)
2. 计算每个人的总成绩并排名(要求显示字段: 学号,姓名,总成绩)
3. 计算每个人单科的最高成绩(要求显示字段: 学号,姓名,课程,最高成绩)
4. 计算每个人的平均成绩(要求显示字段: 学号,姓名,平均成绩)
5. 列出各门课程成绩最好的学生(要求显示字段: 学号,姓名,科目,成绩)
6. 列出各门课程成绩最好的两位学生(要求显示字段: 学号,姓名,科目,成绩)
7. 统计如下:
学号 |
姓名 |
语文 |
数学 |
英语 |
总分 |
平均分 |
|
|
|
|
|
|
|
8.列出各门课程的平均成绩(要求显示字段:课程,平均成绩)
9.列出数学成绩的排名(要求显示字段:学号,姓名,成绩,排名)
10.列出数学成绩在2-3名的学生(要求显示字段:学号,姓名,科目,成绩)
11.求出李四的数学成绩的排名
12.统计如下:
课程 |
不及格(0-59)个 |
良(60-80)个 |
优(81-100)个 |
|
|
|
|
13.统计如下:数学:张三(50分),李四(90分),王五(90分),赵六(76分)
答案:
1. 计算每个人的总成绩并排名
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2. 计算每个人的总成绩并排名
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3. 计算每个人单科的最高成绩
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4.计算每个人的平均成绩
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5.列出各门课程成绩最好的学生
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6.列出各门课程成绩最好的两位学生
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7.学号 姓名 语文 数学 英语 总分 平均分
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8.列出各门课程的平均成绩
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9.列出数学成绩的排名
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10. 列出数学成绩在2-3名的学生
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11. 求出李四的数学成绩的排名
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12. 课程 不及格(-59) 良(-80) 优(-100)
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