Question

我需要了解如何生成一个字母数字字符串，该字符串遵循我正在使用的this question答案中的格式，除非它必须采用以下格式：

元音+辅音+元音+辅音+ 4位数字

例如ABAB1111或IJUZ9236。

感谢您的任何建议。

Answer 1

我假设您想要一个随机字符串。这样的事情应该有效：

with v as (
      select 'A' as c union all select 'E' union all . . . 
     ),
     c as (
      select 'B' as c union all select 'C' union all . . .
     ),
     d as (
      select '0' as c union all select '1' union all . . .
     )
select ((select top 1 c from v order by newid()) +
        (select top 1 c from c order by newid()) +
        (select top 1 c from v order by newid()) +
        (select top 1 c from c order by newid()) +
        (select top 1 c from d order by newid()) +
        (select top 1 c from d order by newid()) +
        (select top 1 c from d order by newid()) +
        (select top 1 c from d order by newid())
       );

Answer 2

您可以按照以下步骤操作：

生成vowels（A,E...）表，consonants（B,C..）表和numbers（1,2,..）表。

然后使用此查询：

SELECT  (SELECT TOP 1 * FROM vowels ORDER BY newid()) +
        (SELECT TOP 1 * FROM consonants ORDER BY newid()) +
        (SELECT TOP 1 * FROM vowels ORDER BY newid()) +
        (SELECT TOP 1 * FROM consonants ORDER BY newid()) +
        (SELECT TOP 1 * FROM numbers ORDER BY newid()) +
        (SELECT TOP 1 * FROM numbers ORDER BY newid()) +
        (SELECT TOP 1 * FROM numbers ORDER BY newid()) +
        (SELECT TOP 1 * FROM numbers ORDER BY newid())

Answer 3

使用临时表作为示例数据我会这样做;

CREATE TABLE #Vowels (Vowel varchar(1))
INSERT INTO #Vowels VALUES ('A'),('E'),('I'),('O'),('U')

CREATE TABLE #Consonants (Consonant varchar(1))
INSERT INTO #Consonants VALUES ('B'),('C'),('D'),('F'),('G'),('H'),('J'),('K'),('L'),('M'),('N'),('P'),('Q'),('R'),('S'),('T'),('V'),('W'),('X'),('Y'),('Z')

CREATE TABLE #Numbers (Numbers varchar(1))
INSERT INTO #Numbers VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9)

SELECT
v1.Vowel + c1.Consonant + v2.Vowel + c2.Consonant + n1.Numbers + n2.Numbers + n3.Numbers + n4.Numbers AS Result

FROM (SELECT TOP 1 Vowel FROM #Vowels ORDER BY NEWID()) v1
CROSS JOIN (SELECT TOP 1 Consonant FROM #Consonants ORDER BY NEWID()) c1
CROSS JOIN (SELECT TOP 1 Vowel FROM #Vowels ORDER BY NEWID()) v2
CROSS JOIN (SELECT TOP 1 Consonant FROM #Consonants ORDER BY NEWID()) c2
CROSS JOIN (SELECT TOP 1 Numbers FROM #Numbers ORDER BY NEWID()) n1
CROSS JOIN (SELECT TOP 1 Numbers FROM #Numbers ORDER BY NEWID()) n2
CROSS JOIN (SELECT TOP 1 Numbers FROM #Numbers ORDER BY NEWID()) n3
CROSS JOIN (SELECT TOP 1 Numbers FROM #Numbers ORDER BY NEWID()) n4

DROP TABLE #Consonants
DROP TABLE #Numbers
DROP TABLE #Vowels

结果如下所示，但每次运行时都会有不同的值。

Result
AQOF7641

如果您多次运行，那么制作包含元音，辅音和数字的正确表格是有意义的。它会降低此查询的（通常很小）成本。

Answer 4

这应该可以解决问题：

WITH letters as
(
  SELECT 'bcdfghjklmnpqrstvwxyz' c, 'aeiou' v
)
,CTE as
(
  SELECT
    SUBSTRING(v, CAST(rand()*5 as int)+1, 1)+
    SUBSTRING(c, CAST(rand()*21 as int)+1, 1)+
    SUBSTRING(v, CAST(rand()*5 as int)+1, 1)+
    SUBSTRING(c, CAST(rand()*21 as int)+1, 1)+
    right(10000+ CAST(rand()*10000 as int),4) x
  FROM letters
)
SELECT x
FROM CTE

Answer 5

DECLARE @AlphaString VARCHAR(200) = NULL;

WITH
    CTE_Digits AS (
    SELECT TOP 255
        ROW_NUMBER() OVER (ORDER BY a.object_id) AS RowNum
    FROM
        sys.all_columns a
    CROSS JOIN
        sys.all_columns b),
    CTE_Types AS (
    SELECT
        CHAR(RowNum) AS Digit,
        CASE
            WHEN RowNum < 58 THEN 'D'
            WHEN CHAR(RowNum) IN ('A','E','I','O','U') THEN 'V'
            ELSE 'C'
        END AS CharType
    FROM
        CTE_Digits
    WHERE
        RowNum BETWEEN 48 AND 57
        OR RowNum BETWEEN 65 AND 90),
    CTE_List AS (
    SELECT
        *,
        ROW_NUMBER() OVER (PARTITION BY CharType ORDER BY NEWID()) AS NewRow
    FROM
        CTE_Types),
    CTE_Ordered AS (
    SELECT
        *,
        CASE CharType
            WHEN 'V' THEN 2
            WHEN 'C' THEN 3
            WHEN 'D' THEN 7
        END * NewRow AS DigitOrder
    FROM
        CTE_List
    WHERE
        (NewRow < 5
        AND CharType = 'D')
        OR NewRow < 3)
SELECT @AlphaString = 
(SELECT
    CAST(Digit AS VARCHAR(MAX))
FROM
    CTE_Ordered
ORDER BY
    DigitOrder
FOR XML PATH(''));

SELECT @AlphaString;

SQL - 生成具有特定格式

5 个答案: