SQL - generate alphanumeric string with specific format - sql

Question

I need to find out how to generate an alphanumeric string that follows the format like in the answer for this question which I'm currently using, except it has to be in the following format:
Vowel + consonant + vowel + consonant + 4-digit number
For example ABAB1111 or IJUZ9236.
Thanks for any suggestion.

Answer 1

You can follow this steps:
Generate a vowels(A,E...) table , consonants (B,C..) table and numbers (1,2,..) table .
Then use this query:
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 2

I assume you want a random string. Something like this should work:
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 3

Using temp tables as example data i'd do it like this;
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
The result comes out like this but with different values each time you run it.
Result
AQOF7641
If you are running this a number of times, it would make sense to make proper tables containing your vowels, consonants and number. It would reduce the (admittedly small) cost of this query.

Answer 4

This should do the trick:
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;