如何在同一查询中多次将行添加到特定数字

Posted 2023-03-29

【中文标题】如何在同一查询中多次将行添加到特定数字

【英文标题】：How to add rows to a specific number multiple times in the same query

【发布时间】：2021-11-25 03:14:41

【问题描述】：

我已经就我的部分问题here寻求帮助。

我过去不管有没有填满都是 10 行。但现在我面临其他事情，我需要在同一个查询结果中多次执行。

WITH NUMBERS AS
(
    SELECT 1 rowNumber
    UNION ALL
    SELECT 2
    UNION ALL
    SELECT 3
    UNION ALL
    SELECT 4
    UNION ALL
    SELECT 5
    UNION ALL
    SELECT 6
    UNION ALL
    SELECT 7
    UNION ALL
    SELECT 8
    UNION ALL
    SELECT 9
    UNION ALL
    SELECT 10
)
SELECT DISTINCT sp.SLC_ID, c.rowNumber, c.PCE_ID
FROM SELECT_PART sp
LEFT JOIN (
    SELECT b.*
    FROM NUMBERS
    LEFT OUTER JOIN (
        SELECT a.*
        FROM (
            SELECT SELECT_PART.SLC_ID, ROW_NUMBER() OVER (ORDER BY SELECT_PART.SLC_ID) as 
            rowNumber, SELECT_PART.PCE_ID
            FROM SELECT_PART
            WHERE SELECT_PART.SLC_ID = (must be the same as sp.SLC_ID and can''t hardcode it)
        ) a
    ) b
    ON b.rowNumber = NUMBERS.rowNumber
) c ON c.SLC_ID = sp.SLC_ID
ORDER BY sp.SLC_ID, c.rowNumber

前 10 行运行良好，但下一个 SLC_ID 只得到 1 个空行

我需要它是这样的

SLC_ID    rowNumer    PCE_ID
1         1           0001
1         2           0002
1         3           NULL
1         ...         ...
1         10          NULL
2         1           0011
2         2           0012
2         3           0013
2         ...         ...
2         10          0020
3         1           0021
3         ...         ...

确实需要这种方式来构建报告。

【参考方案1】：

创建一个数字表，而不是手动构建一个特定于查询的数字列表，其中您必须包含您需要的每个可能的数字（在本例中为 1 到 10）。

DECLARE @UpperBound INT = 1000000;

;WITH cteN(Number) AS
(
  SELECT ROW_NUMBER() OVER (ORDER BY s1.[object_id]) - 1
  FROM sys.all_columns AS s1
  CROSS JOIN sys.all_columns AS s2
)
SELECT [Number] INTO dbo.Numbers
FROM cteN WHERE [Number] <= @UpperBound;

CREATE UNIQUE CLUSTERED INDEX CIX_Number ON dbo.Numbers([Number])
WITH 
(
  FILLFACTOR = 100,      -- in the event server default has been changed
  DATA_COMPRESSION = ROW -- if Enterprise & table large enough to matter
);

Source: mssqltips

或者，由于您无法添加数据，请使用 SQL Server 中已存在的表。

WITH NUMBERS AS
(
SELECT DISTINCT Number as rowNumber FROM master..spt_values where type = 'P'
)
SELECT DISTINCT sp.SLC_ID, c.rowNumber, c.PCE_ID
FROM SELECT_PART sp
LEFT JOIN (
    SELECT b.*
    FROM NUMBERS
    LEFT OUTER JOIN (
        SELECT a.*
        FROM(
            SELECT SELECT_PART.SLC_ID, ROW_NUMBER() OVER (ORDER BY SELECT_PART.SLC_ID) as 
            rowNumber, SELECT_PART.PCE_ID
            FROM SELECT_PART
            WHERE SELECT_PART.SLC_ID = (must be the same as sp.SLC_ID and can''t hardcode it)
        ) a
    ) b
    ON b.rowNumber = NUMBERS.rowNumber
) c ON c.SLC_ID = sp.SLC_ID
ORDER BY sp.SLC_ID, c.rowNumber

注意：此解决方案的最大值为 2047

【讨论】：

我无法更改数据库结构。即使临时存储数据，我也不允许创建索引或表

@EricBrochu 将10 更改为0，您可以多次使用从现有NUMBERS CTE 到自身的CROSS JOIN 快速生成任意大的数字集合.

@EricBrochu，你能做到WITH NUMBERS AS (SELECT DISTINCT number from master..spt_values where type = 'P')吗？