如何分区传播价值？

Question

我有一个 table 数据：

客户

序列
ID
许多其他列（不重要）

示例数据：

Sequence ID
-----------
214906 2613
214906 2614
214906 2615
214907 2613
214907 2614
214907 2615
214908 2613
214908 2614
214908 2615
214000 2613
213004 4444
111111 5555
111111 5556
111112 5556 
111112 5555

怎样才能得到下面想要的结果？

214906 2613
214907 2614
214908 2615
214000 2613
213004 4444
111111 5555
111112 5556

我用 ROW_NUMBER() OVER(PARTITION BY Sequence) 尝试了各种东西，但没有用，因为我需要在第一组中使用第 1 行，在第二组中使用第 2 行等。换句话说，我需要以某种方式将这些序列分散到身份证。我也不能按 ID 分区，因为它们可能在 table

中出现不止一次

Answer 1

希望我理解正确。我使用每个序列的 ID 计数作为组因子（使用 SUM() 和 OVER 子句而不使用 ORDER BY），然后进行适当的排名和行编号：

输入：

CREATE TABLE #Data (
    Sequence int,
    ID int
)
INSERT INTO #Data 
    (Sequence, ID)
VALUES
    (214906, 2613),
    (214906, 2614),
    (214906, 2615),
    (214907, 2613),
    (214907, 2614),
    (214907, 2615),
    (214908, 2613),
    (214908, 2614),
    (214908, 2615),
    (214000, 2613),
    (213004, 4444),
    (111111, 5555),
    (111111, 5556),
    (111112, 5556), 
    (111112, 5555)

T-SQL:

;WITH SequenceCTE AS (
    SELECT 
        *,
        COUNT(*) OVER (PARTITION BY Sequence) AS SequenceCnt
    FROM #Data
), RankCTE AS (
    SELECT 
        *,
        DENSE_RANK() OVER (PARTITION BY SequenceCnt, Sequence ORDER BY SequenceCnt, ID) AS RankNo,
        ROW_NUMBER() OVER (PARTITION BY SequenceCnt, ID ORDER BY Sequence, ID) AS RowNo
    FROM SequenceCTE 
)
SELECT Sequence, ID
FROM RankCTE
WHERE RankNo = RowNo

输出：

----------------
Sequence    ID
----------------
214000      2613
213004      4444
111111      5555
111112      5556
214906      2613
214907      2614
214908      2615

更新（序列中有一个 ID 的特殊情况）：

;WITH SequenceCTE AS (
    SELECT 
        *,
        COUNT(*) OVER (PARTITION BY Sequence) AS SequenceCnt
    FROM #Data
), RankCTE AS (
    SELECT 
        *,
        CASE 
            WHEN SequenceCnt = 1 THEN 1
            ELSE DENSE_RANK() OVER (PARTITION BY SequenceCnt, Sequence ORDER BY SequenceCnt, ID) 
        END AS RankNo,
        CASE 
            WHEN SequenceCnt = 1 THEN 1
            ELSE ROW_NUMBER() OVER (PARTITION BY SequenceCnt, ID ORDER BY Sequence, ID) 
        END AS RowNo
    FROM SequenceCTE 
)
SELECT Sequence, ID
FROM RankCTE
WHERE RankNo = RowNo

如何分区传播价值？

How to partition to spread values?

sql-server

row-number

data-partitioning

客户