Question

我正在使用SQL Server 2008并查找将根据数量重复记录的查询

表包含QTY和PartNumber列。需要为每个QTY添加额外的记录。所以说一个零件编号的数量是3.我需要三行与该编号。

任何帮助将不胜感激。谢谢。

Answer 1

测试数据

CREATE TABLE Test_Table
(
   PartNumber       VARCHAR(20) , 
   Quantity         INT, 
   [Description]    VARCHAR(20), 
   Category         VARCHAR(20),  
   Size             VARCHAR(20), 
   Tags             VARCHAR(20)
)
GO
INSERT INTO Test_Table 
VALUES
('Part 100', 3, 'Description 100', 'Cat100', 'Size100', 'Tag100'),
('Part 101', 2,'Description 101', 'Cat101', 'Size101', 'Tag101')
GO

<强>查询

;WITH CTE (Vals) 
AS (
    SELECT 1 

     UNION ALL

    SELECT 1 + Vals 
    FROM CTE WHERE Vals < 99
   )
SELECT A.PartNumber
      , 1 AS QTY
      ,A.Category
      ,A.[Description]
      ,A.Size
      ,A.Tags
FROM       Test_Table A 
INNER JOIN CTE C   ON C.Vals <= A.Quantity
ORDER BY A.PartNumber

结果集

╔════════════╦═════╦══════════╦═════════════════╦═════════╦════════╗
║ PartNumber ║ QTY ║ Category ║   Description   ║  Size   ║  Tags  ║
╠════════════╬═════╬══════════╬═════════════════╬═════════╬════════╣
║ Part 100   ║   1 ║ Cat100   ║ Description 100 ║ Size100 ║ Tag100 ║
║ Part 100   ║   1 ║ Cat100   ║ Description 100 ║ Size100 ║ Tag100 ║
║ Part 100   ║   1 ║ Cat100   ║ Description 100 ║ Size100 ║ Tag100 ║
║ Part 101   ║   1 ║ Cat101   ║ Description 101 ║ Size101 ║ Tag101 ║
║ Part 101   ║   1 ║ Cat101   ║ Description 101 ║ Size101 ║ Tag101 ║
╚════════════╩═════╩══════════╩═════════════════╩═════════╩════════╝

Answer 2

如果您的数量超过MAXRECURSION，则可以切换到其他数字生成子查询

With B (N) AS (
  SELECT 0 UNION ALL SELECT 1 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
), C (N) AS (
  SELECT b.N + t.N*10 + h.N*100
  FROM   b 
         CROSS JOIN b t
         CROSS JOIN b h
)
SELECT A.PartNumber
     , 1 AS QTY
     , A.Category
     , A.[Description]
     , A.Size
     , A.Tags
     , A.Sheet
     , A.Room
FROM   Test_Table A 
       INNER JOIN C ON C.n <= A.QTY
ORDER BY A.PartNumber

如果您的基表有很多行，更好的方法是创建一个临时或永久的表来存储数字生成器的结果，然后将该表连接到基表。

WITH B (N) AS (
  SELECT 0 UNION ALL SELECT 1 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
)
SELECT b.N + t.N*10 N
INTO   #number
FROM   b 
       CROSS JOIN b t
       CROSS JOIN b h
GO

SELECT A.PartNumber
     , 1 AS QTY
     , A.Category
     , A.[Description]
     , A.Size
     , A.Tags
     , A.Sheet
     , A.Room
FROM   Test_Table A 
       INNER JOIN #number ON #number.N <= A.QTY
ORDER BY A.PartNumber

Answer 3

我想做同样的事情，为了使函数更有用，我根据代码示例创建了一个表函数：

CREATE FUNCTION dbo.tfn_all_ints(@max_val integer) 
RETURNS @retTable TABLE 
 (
  val INT 
 )
BEGIN
/* returns @max_val rows with Vals 1 to @max_val */
/* limited to 99 because of the recursion limit  */
WITH CTE (Vals) 
AS (
    SELECT 1 
    UNION ALL
    SELECT 1 + Vals 
    FROM CTE WHERE Vals < 99
   )

INSERT INTO @retTable(val)
SELECT Vals
FROM CTE C 
WHERE Vals <= @max_val

RETURN
END

通话示例： SELECT * FROM tfn_all_ints（2）

查询将根据数量重复记录

3 个答案: