Question

现有表格如下：

tmc         speed
ABC         55
DEF         55

我想使用SQL Server 2008中的现有表创建一个类似下面的表：

tmc            speed
ABC            55
ABC            56
ABC            57
ABC            58
ABC            59
ABC            60
DEF            55
DEF            56
DEF            57
DEF            58
DEF            59
DEF            60

我开发的代码没有向我显示我想要的确切结果。任何帮助将受到高度赞赏。

我用来解决问题的代码是：

; WITH mycte AS 
( SELECT [tmc_code], [speed] FROM table_1 
  UNION ALL 
  SELECT [tmc_code], [speed]+1 FROM table_1 WHERE [speed]+1 <=60 ) 
SELECT [tmc_code], [speed] FROM mycte

Answer 1

你在找这样的东西吗？

;WITH mycte AS (
  SELECT 1 n
  UNION ALL
  SELECT n + 1 FROM mycte WHERE n < 100
)
SELECT tmc_code, speed + n - 1 speed
  FROM table1 CROSS JOIN mycte
 WHERE mycte.n BETWEEN 1 AND 6
 ORDER BY tmc_code, speed

输出：

| TMC_CODE | SPEED |
|----------|-------|
|      ABC |    55 |
|      ABC |    56 |
|      ABC |    57 |
|      ABC |    58 |
|      ABC |    59 |
|      ABC |    60 |
|      DEF |    55 |
|      DEF |    56 |
|      DEF |    57 |
|      DEF |    58 |
|      DEF |    59 |
|      DEF |    60 |

这是 SQLFiddle 演示

Answer 2

考虑一个持久数字表it can have many uses，包括您目前的问题。

使用数字表，您可以执行以下操作：

SELECT
  t.tmc_code,
  speed = t.speed + n.Number
FROM table_1 AS t
INNER JOIN numbers AS n ON n.Number BETWEEN t.speed AND t.speed + 5
;

如何将列的值增加到其他列中的值的特定范围？

2 个答案: