sumover用法,以及与groupby的区别
1、sum over用法 sum(col1) over(partition by col2 order by col3 ) 以上的函数可以理解为:按col2 进行分组(partition ),每组以col3 进行排序(order),并进行连续加总(sum) 表a,内容如下: B C D 02 02 1 02 03 2 02 04 3 02 05 4 02 01 5 02 06 6 02
1、sum over用法
sum(col1) over(partition by col2 order by col3 )
以上的函数可以理解为:按col2 进行分组(partition ),每组以col3 进行排序(order),并进行连续加总(sum)
表a,内容如下:
B C D
02 02 1
02 03 2
02 04 3
02 05 4
02 01 5
02 06 6
02 07 7
02 03 5
02 02 12
02 01 2
02 01 23
执行:SELECT b, c, d, SUM(d) OVER(PARTITION BY b,c ORDER BY d) e FROM a
得到结果:
B C E
02 01 2
02 01 7
02 01 30
02 02 1
02 02 13
02 03 2
02 03 7
02 04 3
02 05 4
02 06 6
02 07 7
可以看到,E列的值是累加和。
2、与group by 的区别
同样的a表:select b,c,sum(d) e from a group by b,c
B C E
02 01 30
02 02 13
02 03 7
02 04 3
02 05 4
02 06 6
02 07 7
区别很明显。

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