SQL 保留或运行总计

Question

我有一张表，其中有一个商店列表，我想按分配量对它们进行排序，然后对于每个商店，我想首先获得最高的分配量并继续总计，直到达到一定数量，例如 60% 和然后为所有这些记录触发一个字段 (ETA60) 为真。

所以我的桌子看起来像这样。

Answer 1

你想要一个运行总和和一些 case 逻辑：

select t.*,
       (case when sum(distr1) over (partition by store order by tract) - distr1 >= 0.6
             then 'X'
        end) as eta60
from t;

Answer 2

您可以使用窗口函数来过滤记录：

SELECT x.store, x.tract, x.distri, x.eta as eta60 from 
(SELECT a.*, coalesce(SUM(distri) OVER(PARTITION BY store 
ORDER BY tract rows between unbounded preceding and 1 preceding ), distri) as eta60,
coalesce(SUM(distri) OVER(PARTITION BY store 
ORDER BY tract rows unbounded preceding ), distri) as eta
FROM
table_dist a) x WHERE coalesce(eta60, distri) <= 60;

如果您不想过滤并仅使用标记“X”标记此类记录，则可以使用以下查询：

SELECT a.*, case when coalesce(SUM(distri) OVER(PARTITION BY store 
ORDER BY tract rows between unbounded preceding and 1 preceding ), distri) <= 60 THEN 'X' END as eta60 FROM
table_dist a;