mysql 行转列 （结果集以坐标显示）

create table capacity(
    type int ,
    numbers int ,
    monthst INT
);

select type,
sum(case monthst when 1 then numbers else 0 end ) 一月,
sum(case monthst when 2 then numbers else 0 end ) 二月,
sum(case monthst when 3 then numbers else 0 end ) 三月,
sum(case monthst when 4 then numbers else 0 end ) 四月,
sum(case monthst when 5 then numbers else 0 end ) 五月,
sum(case monthst when 6 then numbers else 0 end ) 六月,
sum(case monthst when 7 then numbers else 0 end ) 七月,
sum(case monthst when 8 then numbers else 0 end ) 八月,
sum(case monthst when 9 then numbers else 0 end ) 九月,
sum(case monthst when 10 then numbers else 0 end ) 十月,
sum(case monthst when 11 then numbers else 0 end ) 十一月,
sum(case monthst when 12 then numbers else 0 end ) 十二月
from capacity group by type;

 按type分组，并对每月的对应type的numbers求和。