sql [sql]从每个类别中选择1个随机行

Posted 2021-05-14

WITH [TableWithRowNumber]
AS
(
	SELECT
		[IndexID], 
		[Name],
		ROW_NUMBER() OVER (PARTITION BY [IndexID] ORDER BY NEWID()) [RowNumber]
	FROM
		[SuggestedNames]
	WHERE
		[CatID] = @CatID
)

SELECT
	[IndexID], [Name]
FROM
	[TableWithRowNumber]
WHERE
	[RowNumber] = 1


--TABLE IS STRUCTURED AS FOLLOWS
--[Name] 		[IndexID]
--Alexandra	    29
--Bartram	    29
--Baldwin	    30
--Anastasia	    30
--Angelica	    31
--Basel	      	31

--OUTPUT IS AS FOLLOWS
--[Name] 		[IndexID]
--Alexandra	    29
--Anastasia	    30
--Basel	      	31