Sql 如何创建基于另一字段中的数量将一行转换为多行的视图？

我正在使用Microsoft SQL

我有一个表格CR_INVLINES，显示如下内容

STOCKCODE     QTY   BARCODE  
GUITAR101     3     456812313
DESK          1     568123122
LAMP          2     845646962

我需要视图返回数量倍数的行，如下所示：

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嗯，对于这个，你需要一个数字表。以下是一个在许多情况下都能使用的快速简便的解决方案：

with numbers as (
       select row_number() over (order by (select null)) as num
      )
select il.stockcode, barcode
from CR_INVLINES il join
     numbers n
     on il.qty <= n.num

更正式的回答是这样的：

with digits as (
     select 0 as d 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
   ),
   numbers as (
    select d1.d*100+d2.d*10+d3.d
    from digits d1 cross join digits d2 cross join digits d3
   )
select il.stockcode, barcode
from CR_INVLINES il join
     numbers n
     on il.qty < n.num

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注意您可以使用递归CTE来获得结果：

;WITH CTE AS
(
    SELECT *
    FROM CR_INVLINES
    UNION ALL 
    SELECT stockcode, qty-1, BARCODE
    FROM CTE
    WHERE qty-1 >= 1
)
SELECT STOCKCODE, Barcode
FROM CTE
order by stockcode
OPTION(MAXRECURSION 0);

| STOCKCODE |   BARCODE |
-------------------------
|      DESK | 568123122 |
| GUITAR101 | 456812313 |
| GUITAR101 | 456812313 |
| GUITAR101 | 456812313 |
|      LAMP | 845646962 |
|      LAMP | 845646962 |

看

结果如下：

;WITH CTE AS
(
    SELECT *
    FROM CR_INVLINES
    UNION ALL 
    SELECT stockcode, qty-1, BARCODE
    FROM CTE
    WHERE qty-1 >= 1
)
SELECT STOCKCODE, Barcode
FROM CTE
order by stockcode
OPTION(MAXRECURSION 0);

| STOCKCODE |   BARCODE |
-------------------------
|      DESK | 568123122 |
| GUITAR101 | 456812313 |
| GUITAR101 | 456812313 |
| GUITAR101 | 456812313 |
|      LAMP | 845646962 |
|      LAMP | 845646962 |

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太棒了，非常感谢我将此应用于DB，效果非常好：