SELECCIONAR DISTINTO en una columna
Usando SQL Server, tengo...
ID SKU PRODUCT
=======================
1 FOO-23 Orange
2 BAR-23 Orange
3 FOO-24 Apple
4 FOO-25 Orange
Quiero
1 FOO-23 Orange
3 FOO-24 Apple
Esta consulta no me está llevando allí. ¿Cómo puedo SELECCIONAR DISTINCT en una sola columna?
SELECT
[ID],[SKU],[PRODUCT]
FROM [TestData]
WHERE ([PRODUCT] =
(SELECT DISTINCT [PRODUCT] FROM [TestData] WHERE ([SKU] LIKE 'FOO-%'))
ORDER BY [ID]
6 answers
Asumiendo que estás en SQL Server 2005 o superior, puedes usar un CTE con ROW_NUMBER ():
SELECT *
FROM (SELECT ID, SKU, Product,
ROW_NUMBER() OVER (PARTITION BY PRODUCT ORDER BY ID) AS RowNumber
FROM MyTable
WHERE SKU LIKE 'FOO%') AS a
WHERE a.RowNumber = 1
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2009-06-08 18:20:09
La solución más simple sería usar una subconsulta para encontrar el ID mínimo que coincida con su consulta. En la subconsulta se usa GROUP BY en lugar de DISTINCT:
SELECT * FROM [TestData] WHERE [ID] IN (
SELECT MIN([ID]) FROM [TestData]
WHERE [SKU] LIKE 'FOO-%'
GROUP BY [PRODUCT]
)
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2012-03-28 08:22:50
Prueba esto:
SELECT
t.*
FROM TestData t
INNER JOIN (SELECT
MIN(ID) as MinID
FROM TestData
WHERE SKU LIKE 'FOO-%'
) dt ON t.ID=dt.MinID
EDITAR
una vez que el OP corrigió su salida samle (anteriormente solo tenía UNA fila de resultados, ahora se muestra toda), esta es la consulta correcta:
declare @TestData table (ID int, sku char(6), product varchar(15))
insert into @TestData values (1 , 'FOO-23' ,'Orange')
insert into @TestData values (2 , 'BAR-23' ,'Orange')
insert into @TestData values (3 , 'FOO-24' ,'Apple')
insert into @TestData values (4 , 'FOO-25' ,'Orange')
--basically the same as @Aaron Alton's answer:
SELECT
dt.ID, dt.SKU, dt.Product
FROM (SELECT
ID, SKU, Product, ROW_NUMBER() OVER (PARTITION BY PRODUCT ORDER BY ID) AS RowID
FROM @TestData
WHERE SKU LIKE 'FOO-%'
) AS dt
WHERE dt.RowID=1
ORDER BY dt.ID
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2012-03-28 08:20:48
Sé que fue preguntado hace más de 6 años, pero el conocimiento sigue siendo conocimiento. Esta es una solución diferente a todas las anteriores, ya que tuve que ejecutarla bajo SQL Server 2000:
DECLARE @TestData TABLE([ID] int, [SKU] char(6), [Product] varchar(15))
INSERT INTO @TestData values (1 ,'FOO-23', 'Orange')
INSERT INTO @TestData values (2 ,'BAR-23', 'Orange')
INSERT INTO @TestData values (3 ,'FOO-24', 'Apple')
INSERT INTO @TestData values (4 ,'FOO-25', 'Orange')
SELECT DISTINCT [ID] = ( SELECT TOP 1 [ID] FROM @TestData Y WHERE Y.[Product] = X.[Product])
,[SKU]= ( SELECT TOP 1 [SKU] FROM @TestData Y WHERE Y.[Product] = X.[Product])
,[PRODUCT]
FROM @TestData X
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2015-11-19 09:01:36
SELECT min (id) AS 'ID', min(sku) AS 'SKU', Product
FROM TestData
WHERE sku LIKE 'FOO%' -- If you want only the sku that matchs with FOO%
GROUP BY product
ORDER BY 'ID'
Prueba esto:
SELECT * FROM [TestData] WHERE Id IN(SELECT DISTINCT MIN(Id) FROM [TestData] GROUP BY Product)
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2018-07-24 13:16:07