sql-server-2008 - char列の最大出現回数の値を取得する方法

Question

列の最大出現回数を取得する際に問題があります

 matnum   uom  amount
-------------------------------------
1234    EA   10
1234    CS   10
1234    EA    20
1235    CS   10
1235    CS    20

---

私の出力選択は

 matnum   uom  SUM(amount)
-------------------------------------
1234   EA (because EA occured Twice)    40
1235   CS                               30

---

希望する結果を得るために、selectクエリを提供してください

Answer 1

ここであなたが望むものについていくつかのことを想定していますが、

SELECT A.matnum, B.uom, C.s AS [SUM(amount)]
FROM yourtable A
INNER JOIN (
    SELECT matnum, uom, 
        ROW_NUMBER() OVER (PARTITION BY matnum ORDER BY COUNT(*) DESC) AS rnm
    FROM yourtable
    GROUP BY matnum, uom
) B ON A.matnum = B.matnum AND B.rnm = 1
INNER JOIN (
    SELECT matnum, SUM(amount) AS s 
    FROM yourtable 
    GROUP BY matnum
) C ON A.matnum = C.matnum
GROUP BY A.matnum, B.uom, C.s

SQL フィドル

Answer 2

select matnum, 
       uom, 
       SUM(amount) as sum_amount
from your_table
group by matnum, uom

Answer 3

select max(matnum) as matnum,max(uom) as uom,SUM(amount)
from yourtable
group by matnum,uom