1

このテーブルがあり、TYPE_MATERIAL/YEARSごとの累積パーセンテージを計算したい

declare @mytable table (TYPE_MATERIAL int, YEARS int, ROW_NUM int, PERCENTUAL_PRICE numeric(6,2))
insert @mytable
select 1,2010,1,54.5
union all select 1,2010,2,37.5
union all select 1,2010,3,8.0

union all select 1,2009,1,72.8
union all select 1,2009,2,21.0
union all select 1,2009,3,6.2

union all select 2,2010,1,61.0
union all select 2,2010,2,36.0
union all select 2,2010,3,3.0

結果は次のようになります。

TYPE_MATERIAL YEARS       ROW_NUM     PERCENTUAL_PRICE    PERCENTUAL_PRICE_cumulative
1             2010        1           54.50               54.5 (=54.5)
1             2010        2           37.50               92.0 (=54.5+37.5)
1             2010        3           8.00                100.0 (=54.5+37.5+8)
1             2009        1           72.80               72.8
1             2009        2           21.00               93.8
1             2009        3           6.20                100.0
2             2010        1           61.00               61.0
2             2010        2           36.00               97.0
2             2010        3           3.00                100.0

このクエリはインターネットで見つかりましたが、TYPE_MATERIALとYEARSが1つしかない場合にのみ累積パーセンテージが計算されるため、この場合には適していません。

select TYPE_MATERIAL, YEARS, ROW_NUM, PERCENTUAL_PRICE,
PERCENTUAL_PRICE_cumulative=
(
select SUM(PERCENTUAL_PRICE) from @mytable b
where b.ROW_NUM<=a.ROW_NUM
)
from @mytable a

助言がありますか？ありがとう

4

3 に答える 3

2 
select TYPE_MATERIAL, YEARS, ROW_NUM, PERCENTUAL_PRICE,
PERCENTUAL_PRICE_cumulative=
(
select SUM(PERCENTUAL_PRICE) from @mytable b
where b.ROW_NUM<=a.ROW_NUM AND b.YEARS = a.YEARS AND b.TYPE_MATERIAL = a.TYPE_MATERIAL
)
from @mytable a
于 2011-09-07T12:16:30.413 に答える
1

あなたの問題は、type_materialと年に制限されていないあなたの内部クエリによって引き起こされます。

select TYPE_MATERIAL, YEARS, ROW_NUM, PERCENTUAL_PRICE,
PERCENTUAL_PRICE_cumulative=
(
select SUM(PERCENTUAL_PRICE) from @mytable b
where b.ROW_NUM<=a.ROW_NUM AND b.type_material = a.type_material AND b.years = a.years
)
from @mytable a

また、非常に大きなデータに対しては問題なく実行される再帰CTEを使用してこれを行うこともできます。

with myCte (TYPE_MATERIAL, YEARS, ROW_NUM, PERCENTUAL_PRICE, PERCENTUAL_PRICE_cumulative)
as
(
    select TYPE_MATERIAL, YEARS, ROW_NUM, PERCENTUAL_PRICE, PERCENTUAL_PRICE AS PERCENTUAL_PRICE_cumulative
    FROM @mytable
    WHERE row_num = 1
    UNION ALL
    select t.TYPE_MATERIAL, t.YEARS, t.ROW_NUM, t.PERCENTUAL_PRICE, CAST(t.PERCENTUAL_PRICE + myCte.PERCENTUAL_PRICE_cumulative AS  numeric(6,2)) AS PERCENTUAL_PRICE_cumulative
    FROM @mytable t
        INNER JOIN myCte ON myCte.type_material = t.type_material AND myCte.years = t.years AND mycte.row_num = t.row_num-1
    WHERE t.row_num > 1
)
SELECT * FROM myCte
ORDER BY  TYPE_MATERIAL, YEARS, ROW_NUM
于 2011-09-07T12:23:10.433 に答える
0

これは、再帰やサブクエリではなく、ウィンドウ関数で解決する必要があります。

SELECT
  type_material, years, row_num, percentual_price
  SUM (percentual_price) OVER (PARTITION BY type_material, years ORDER BY row_num) cumulative
FROM @mytable
于 2019-02-14T16:08:24.193 に答える