mySQL的行转列

因为MYSQL里边没有

 PIVOT 

 

 

现记录：

 

原表格：

 

mysql语句：

SELECT
MAX(CASE WHEN corol='红' THEN NUM else 0 END) AS RED,
MAX(CASE WHEN corol='橙' THEN NUM else 0 END) AS green1,
MAX(CASE WHEN corol='黄' THEN NUM else 0 END) AS green2,
MAX(CASE WHEN corol='绿' THEN NUM else 0 END) AS green3
FROM (
SELECT
SUM(NUM)AS NUM,corol
FROM
(
SELECT
CASE WHEN LoadDegree=0
THEN 1
ELSE 0 END NUM,
CASE WHEN LoadDegree=0
THEN '红'
WHEN LoadDegree=1
THEN '橙'
WHEN LoadDegree=2
THEN '黄'
WHEN LoadDegree=3
THEN '绿'
ELSE '无法识别颜色' END corol
FROM tb_test_IndicatorData
)A group by corol
)A

NUM	COLOR
0	橙
2	红
0	绿
0	黄