Question

我有sql表，如图所示

Name  |eng    |kisw
Jane  |A      |B
Ann   |B      |B
Mag   |B      |B

我需要计算Eng A=1 B=2和Kisw B=3

等等

我有sql代码，但显示错误的数据

SELECT name,COUNT(eng),COUNT(kisw) FROM form1 GROUP BY eng ,kisw

Answer 1

我想，这会有所帮助：

SELECT 'ENG' as SUBJECT, ENG AS GRADE, COUNT(ENG) AS GRADE_COUNT FROM YOUR_TABLE GROUP BY ENG
UNION
SELECT 'KISW' AS SUBJECT, KISW AS GRADE, COUNT(KISW) AS GRADE_COUNT FROM YOUR_TABLE GROUP BY KISW

输出是：

ENG     |A   |1
ENG     |B   |2
KISW    |B   |3

运行测试查询使用：

WITH TEST_DATA AS
(
SELECT 'JANE' NAME, 'A' ENG, 'B' KISW FROM DUAL
UNION
SELECT 'ANN' NAME, 'B' ENG, 'B' KISW FROM DUAL
UNION
SELECT 'MAG' NAME, 'B' ENG, 'B' KISW FROM DUAL

)

SELECT 'ENG' SUBJECT, ENG GRADE, COUNT(ENG) GRADE_COUNT FROM TEST_DATA GROUP BY ENG
UNION
SELECT 'KISW' SUBJECT, KISW GRADE, COUNT(KISW) GRADE_COUNT FROM TEST_DATA GROUP BY KISW

Answer 2

尝试这是有帮助的

select name,
    sum(eng = 'A') totalA,
    sum(eng= 'B') totalB,
    sum(eng = 'C') totalC
from student
group by name

了解更多详情，请访问此

等级显示在java和sql中

2 个答案: