Question

我需要创建一个自定义序列，该序列应为以下范围创建序列 XV00AA-XV99ZZ和许多其他范围

示例：

XV00AA, XV01AA, XV02AA, ......XV99AA

前两个字符保持不变（示例-XV系列）；最后2个字符保持不变（示例-AA系列）；但中间的2个字符应从0到99递增。（例如XV01AA, XV02AA, XV03AA，依此类推）

一旦达到99（即XV99AA），就应该对AB系列重复因此输出应为

XV00AB, XV01AB, XV02AB, .....XV99AB

然后

XV00AC,XV01AC,XV02AC....XV99AC

因此示例最终输出：

XV00AA
XV01AA
XV02AA
....
XV99AA
XV00AB
XV01AB
XV02AB
....
XV99AB
XV00AC
XV01AC
XV02AC
...
XV99AC
XV00AD
XV01AD
XV02AD
...
XV99AD

，依此类推。有没有简单的方法来创建这些系列？任何帮助将不胜感激

Answer 1

这应该可以解决问题。

DECLARE @how_many_do_you_want INT = 67599;  -- 67599 is where it runs out of legit values.

WITH 
    cte_n1 (n) AS (SELECT 1 FROM (VALUES (1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) n (n)), 
    cte_n2 (n) AS (SELECT 1 FROM cte_n1 a CROSS JOIN cte_n1 b),
    cte_n3 (n) AS (SELECT 1 FROM cte_n2 a CROSS JOIN cte_n2 b),
    cte_Tally (n) AS (
        SELECT TOP (@how_many_do_you_want)
            ROW_NUMBER() OVER (ORDER BY (SELECT NULL))
        FROM
            cte_n3 a CROSS JOIN cte_n3 b
        )
SELECT 
    rn = t.n,
    CONCAT('XV', cn.char_num, a.alpha_1, a.alpha_2)
FROM
    cte_Tally t
    CROSS APPLY ( VALUES (t.n % 100) ) m (mod_100)
    CROSS APPLY ( VALUES (((t.n - m.mod_100) / 100) % 26 + 1) ) g1 (group_1)
    CROSS APPLY ( VALUES (t.n / 2600 + 1) ) g2 (group_2)
    CROSS APPLY ( VALUES (RIGHT(CONCAT('0', m.mod_100), 2)) ) cn (char_num)
    CROSS APPLY ( VALUES (CHAR(g1.group_1 + 64), CHAR(g2.group_2 + 64)) ) a (alpha_1, alpha_2);

Answer 2

以下代码使用CTE生成一个从0到67,599的数字表。然后将这些值分开：模数（%）提供数字的值，而整数除法（/）提供字母的值。格式化和转换有点麻烦，鲍勃是你的叔叔。

with Numbers as (
  select 0 as N
  union all
  select N + 1
    from Numbers
    where N < 67599 )
  select N, N % 100 as DigitsValue, N / 100 as LettersValue,
    Right( '0' + Cast( N % 100 as VarChar(2) ), 2 ) as LeftPaddedDigits,
    Char( ASCII( 'A' ) + ( N / 100 ) % 26 ) as LeastSignificantLetter,
    Char( ASCII( 'A' ) + ( N / 100 ) / 26 ) as MostSignificantLetter
    from Numbers
  option ( MaxRecursion 0 )

将完整的字符串连同“ XV”作为前缀一起留给读者。

创建自定义序列

2 个答案: