Question

我要求从YEAR划分的数量的和中找出最大值（需要编写Oracle查询）。

例如

 ITEM_ID     ORG_ID     YEAR    QTY

  100         121        2015    10
  100         121        2016    5
  100         121        2017    8
  101         146        2014    10
  101         146        2015    11
  101         146        2016    12
  101         146        2017    13

我的输出应该是这样的： -

for Item_id 100,121 the max_avg should be max(10+5+8/3, 5+10/2, 10/1)... max (7.6, 7.5, 8) = 8
for Item_id 101,146 the max_avg should be (11+12+13/3, 12+13/2, 13/1)... max(11.5, 12, 12.5, 13) = 13... I should not consider 10+11+12+13/4。我只需要考虑过去3年累积的AVG并分配最大值

 ITEM_ID     ORG_ID     YEAR    QTY   MAX_AVG

  100         121        2015    10   8
  100         121        2016    5    8
  100         121        2017    8    8
  101         146        2014    10   13
  101         146        2015    11   13
  101         146        2016    12   13
  101         146        2017    13   13

非常感谢任何帮助。

Answer 1

一种方法使用两级分析函数：

select t.*, max(running_avg_3) over (partition by item_id)
from (select t.*,
             avg(qty) over (partition by item_id order by year desc
                            rows between current row and 2 following
                           ) as running_avg_3
      from t
     ) t

Answer 2

select item_id, org_id, yr, qty,
       greatest (
 avg(case when yr = 2017                then qty end) over (partition by item_id, org_id),
 avg(case when yr in (2016, 2017)       then qty end) over (partition by item_id, org_id),
 avg(case when yr in (2015, 2016, 2017) then qty end) over (partition by item_id, org_id)
       ) as max_avg
from   inputs_table
;

Oracle Query将按年份汇总数量 - 仅过去3年

2 个答案: