Question

SELECT
*
FROM (
    SELECT      
        row_number() OVER (ORDER BY ID) AS [rownum],
        UserID, wfoKey 
    FROM
        tbl_user_statistics2 Where (wfoKey = '4b1fbf7aa7')
) T
WHERE 
rownum BETWEEN (@opt_start) AND (@opt_end)

以上查询有效并将所有UserID从第1行（opt_start）提取到10,000（opt_end）。在该数据集中，那些UserID是重复的。我现在想要为该行范围（1到10,000）中的记录提取唯一的UserID。用户可以选择任何范围，以便他们可以选择10,0000到20,0000，因此查询应该获得该范围内的唯一UserID，依此类推。我不需要结果中的rownum。

示例数据：

1   dced6f0d-3a67-456d78cb7-fb73c8db0c13    4b1fbf7aa7
2   dced6f0d-3a67-456d78cb7-fb73c8db0c13    4b1fbf7aa7
3   6360f485-4f4d-4c9a98b0e-74fea312a25d    4b1fbf7aa7
4   6360f485-4f4d-4c9a98b0e-74fea312a25d    4b1fbf7aa7

结果将是：

dced6f0d-3a67-456d78cb7-fb73c8db0c13    4b1fbf7aa7
6360f485-4f4d-4c9a98b0e-74fea312a25d    4b1fbf7aa7

不确定如何继续或者可能有比row_number（）更好的方法。任何建议都会非常感激。

Answer 1

这可以通过获取现有查询并将其转换为内嵌视图（T2）然后从中查询不同记录来解决：

SELECT DISTINCT UserID, wfoKey FROM
(SELECT
*
FROM (
    SELECT      
        row_number() OVER (ORDER BY ID) AS [rownum],
        UserID, wfoKey 
    FROM
        tbl_user_statistics2 Where (wfoKey = '4b1fbf7aa7')
) T
WHERE 
rownum BETWEEN (@opt_start) AND (@opt_end)) T2

Answer 2

;With CTE1
AS
 (
 SELECT * , rn = ROW_NUMBER() OVER (PARTITION BY UserID ORDER BY wfoKey)
 FROM tbl_user_statistics2 
 Where wfoKey = '4b1fbf7aa7'
 ),
 CTE2
 AS
 (
  SELECT ID, UserID, wfoKey 
       , RowNum = ROW_NUMBER() OVER (ORDER BY wfoKey)
  FROM CTE1 
  WHERE rn = 1 
  )
SELECT ID, UserID, wfoKey 
FROM CTE2
WHERE RowNum BETWEEN (@opt_start) AND (@opt_end)

Answer 3

您可以通过userID

添加一个名为分区的作品

    ;with cte as(
    SELECT
    *
    FROM (
        SELECT      
            row_number() OVER (partition by USerID ORDER BY ID) AS [rownum],
            UserID, wfoKey 
        FROM
            tbl_user_statistics2 Where (wfoKey = '4b1fbf7aa7')
    ) T
    WHERE 
    rownum BETWEEN (@opt_start) AND (@opt_end) 
    )

    Select * from cte
    where rownum =1

SQL Server在row_number（）记录范围内的唯一记录

3 个答案: