学期明智的结果并按范围显示 cgpa 计数

Question

如何按学期和年级范围计算年级计数。

我有如下表格、字段和数据：

SEMETSER

SEMISTER_NO	NAME
1	FIRST
2	SECOND

STUDENT_SEMETSER

STUDENT_NO	SEMESTER_NO	SCORE
1	1	9.8
2	1	9.2
3	1	8.8
4	1	7.8
5	1	7.5
6	1	7.2
7	2	8.8
8	2	8.2
9	2	8.8
10	2	6.8
11	2	6.5
12	2	6.2

预期结果：

SEMESTER_NO	SCORE 10-9	SCORE 9-8	8-7	7-6	6-5	5-4
1	2	1	3	0	0	0
2	0	3	0	2	0	0

Answer 1

使用CASE-WHEN 和PIVOT 是其中一种选择：

SELECT *
FROM 
(
  SELECT semester_no,
          CASE 
            WHEN SCORE>= 9 and SCORE<=10 THEN 'Score 10-9'
            WHEN SCORE>= 8 and SCORE<9 THEN 'Score 9-8'
            WHEN SCORE>= 7 and SCORE<8 THEN 'Score 8-7'
            WHEN SCORE>= 6 and SCORE<7 THEN 'Score 7-6'
            WHEN SCORE>= 5 and SCORE<6 THEN 'Score 6-5'
            WHEN SCORE>= 4 and SCORE<5 THEN 'Score 5-4'
          END AS score_cat
   FROM student_semester
)
PIVOT 
(
   COUNT(score_cat)
   FOR score_cat IN ('Score 10-9','Score 9-8','Score 8-7','Score 7-6','Score 6-5','Score 5-4')
)
ORDER BY semester_no

CASE 语句会将分数分类到不同的桶中（根据您的需要进行修改），PIVOT 语句会将数据转换为所需的级别。

DEMO