多分このようなもの:
SELECT
SUM(t1.maxAmout)
FROM
(
SELECT
MAX(t.Amout) AS maxAmout,
t.Category
FROM
yourTable AS t
GROUP BY
t.Category
) AS t1
このようにすることもできます。SQL Server 2005 以降を使用している場合:
SELECT
pvt.[1],
pvt.[2],
pvt.[3],
(
pvt.[1]+
pvt.[2]+
pvt.[3]
) AS Total
FROM
(
SELECT
t.Category,
t.Amout
FROM
yourTable AS t
) AS SourceTable
PIVOT
(
MAX(Amout)
FOR Category IN([1],[2],[3])
) AS pvt
編集
1000のカテゴリがある場合。その場合、動的ピボットが最適なソリューションになります。このように:
テストデータ
CREATE TABLE #T
(
Category INT,
Amout FLOAT
)
INSERT INTO #T
VALUES
(1,4.6),
(1,4.6),
(1,4.6),
(2,5),
(3,4)
一意の列名
DECLARE @cols VARCHAR(MAX)
DECLARE @colsTotal VARCHAR(MAX)
;WITH CTE
AS
(
SELECT
ROW_NUMBER() OVER(PARTITION BY t.Category ORDER BY t.Amout) AS RowNbr,
t.*
FROM
#T AS t
)
SELECT @cols = COALESCE(@cols + ','+QUOTENAME(Category),
QUOTENAME(Category)),
@colsTotal=COALESCE(@colsTotal + '+ISNULL('+QUOTENAME(Category)+',0)',
'ISNULL('+QUOTENAME(Category)+',0)')
FROM
CTE
WHERE
CTE.RowNbr=1
ORDER BY
Category
動的ピボット
DECLARE @query NVARCHAR(4000)=
N'SELECT
'+@cols+',
(
'+@colsTotal+'
) AS Total
FROM
(
SELECT
t.Category,
t.Amout
FROM
#T AS t
) AS SourceTable
PIVOT
(
MAX(Amout)
FOR Category IN('+@cols+')
) AS pvt'
EXECUTE(@query)