如何将客户分组到相等的收入组中？

Question

真的很难找到这个问题的答案。有各种函数提供 Ntiles。这些通常为每个图块提供相等的行集。

我需要按（近似）相等的收入集对客户进行分组。这样我就可以显示负责收入前 10% 和接下来的 10% 等的客户

换句话说，所有客户都按收入排序并按收入的十分位数分组。

        create table test_set (name text, revenue numeric);

        insert into test_set values ('a1',234.34);
        insert into test_set values ('a2',263.60);
        insert into test_set values ('a3',316.99);
        insert into test_set values ('a4',351.68);
        insert into test_set values ('a5',353.07);
        insert into test_set values ('a6',406.33;
        insert into test_set values ('a7',432.78);
        insert into test_set values ('a8',444.88);
        insert into test_set values ('a9',452.21);
        insert into test_set values ('a10',543.75);
        insert into test_set values ('a11',582.43);
        insert into test_set values ('a12',670.98);
        insert into test_set values ('a13',720.46);
        insert into test_set values ('a14',801.69);
        insert into test_set values ('a15',803.92);
        insert into test_set values ('a16',821.03);
        insert into test_set values ('a17',875.57);
        insert into test_set values ('a18',930.95);
        insert into test_set values ('a19',973.49);
        insert into test_set values ('a20',1055.48);
        insert into test_set values ('a21',1059.01);
        insert into test_set values ('a22',1131.09);
        insert into test_set values ('a23',1215.51);
        insert into test_set values ('a24',1232.19);
        insert into test_set values ('a25',1310.59);
        insert into test_set values ('a26',1353.31);
        insert into test_set values ('a27',1368.28);
        insert into test_set values ('a28',1412.58);
        insert into test_set values ('a29',1412.38);
        insert into test_set values ('a30',1489.78);
        insert into test_set values ('a31',1496.31);
        insert into test_set values ('a32',1587.17);
        insert into test_set values ('a33',3629.34);
        insert into test_set values ('a34',4642.01);
        insert into test_set values ('a35',6682.07);
        insert into test_set values ('a36',752.70);
        insert into test_set values ('a37',3819.59);
        insert into test_set values ('a38',2857.22);
        insert into test_set values ('a39',873.45);
        insert into test_set values ('a40',882.42);

希望有人能帮忙...谢谢

Answer 1

使用累积 SUM() window 函数可能有帮助：

demo:db<>fiddle

select
    name, revenue,
    sum(revenue) OVER () as total,
    sum(revenue) OVER (ORDER BY revenue) as cumulative,
    (sum(revenue) OVER (ORDER BY revenue) / sum(revenue) OVER () * 100) as cumulative_procent,
    trunc((sum(revenue) OVER (ORDER BY revenue) / sum(revenue) OVER () * 100) / 10) as group_by_tenth
from test_set
order by revenue

列：计算收入总和
列：计算按收入排序的累计 SUM
列：计算递增百分比值的两项均取
列：对于聚类，您可以将此结果截断为十分之一

Answer 2

S-MAN - 就是这样...非常感谢。我稍微加强了

   ceil(((sum(sum(revenue)) OVER (ORDER BY sum(revenue)) / sum(sum(revenue)) OVER () * 100) /10)) as revenue_sets

如何将客户分组到相等的收入组中？

How do I group customers in to equal sets of revenue?

postgresql

window

function

percentile

quartile