樞軸列到mysql結果輸出中的行

Question

我有以下結果

A   B   C
1   2   3

我如何得到像

title1  title2
A   1
B   2
C   3

我的查詢是這樣的

select
sum(if(d =4,1,0)) AS 'A',
sum(if(d = 4 and (datediff(curdate(), r_date)=1),1,0)) AS ' B',
sum(if(d = 1 and (datediff(curdate(), r_date)=2),1,0)) AS ' C'
from delay ;

Answer 1

看來您正在嘗試取消MySQL中的表格。 一種方法是使用一系列聯合：

SELECT 'A' AS title1, A AS title2
FROM delay
UNION ALL
SELECT 'B' AS title1, B AS title2
FROM delay
UNION ALL
SELECT 'C' AS title1, C AS title2
FROM delay