分类统计
sum(b.theor_weight) over() sumTheorWeight,
sum(b.NUM_REQUIRE)over() sumNumRequire,
分类统计
sum(b.theor_weight)over(partition by a.billno) sumTheorWeight,
sum(b.NUM_REQUIRE)over(partition by a.billno) sumNumRequire,
--用法详解
0、select * from wmg_test; ---测试数据
1、select v1,v2,sum(v2) over(order by v2) as sum --按照 v2排序，累计n+n-1+....+1
from wmg_test;
2、select v1,v2,sum(v2) over(partition by v1 order by v2) as sum --先分组，组内在进行 1 中的操作
from wmg_test;
3、select v1,v2,sum(v2) over(partition by v1 order by v1) as sum ---稳定排序
from wmg_test;
4、select v1,v2,sum(v2) over(partition by v1) as sum --相同key的进行回填处理
from wmg_test;
5、select distinct v1,sum_01 --取一条
from (
select v1,sum(v2) over(partition by v1) as sum_01
from wmg_test
) a;
6、当然也可以逆序累加，只需order by desc 即可
总结区别：group by 和partition by的区别
group 单纯分组
partition 也能分组，但还具备累计的功能
https://blog.csdn.net/zhuiqiuuuu/article/details/79088709
总结区别：group by 和partition by的区别
group 单纯分组
partition 也能分组，但还具备累计的功能
sql统计sum over() sum(b.theor_weight)over(partition by a.billno)
原文：https://www.cnblogs.com/gzhbk/p/12401267.html
