how to find a input contains more than three repeating char ex:(Acabacaga) in sql query

Question

1.00/5 (1 vote)

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SQL-Server-2008R2

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hello guys,

I want to find A input contains more than three repeating chars,please suggest me query for that.

ex:

Input=Acabacaga

i want restict the input shuld not containing more than three duplicate letter.upto 2 dullicate chr is ok..but i shold not contatin three or more dulicate letters.

Thanks in advance.

Rajshree V Lande.

Posted 6-Oct-14 20:02pm

rajshreelande

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3 solutions

Solution 1

Hi Rajshree,

You can try this

SQL

SELECT len('acabacaga') - len(replace('acabacaga','a','')) As NoOfTimesACharacterIsRepeated.

You can store its output in a variable and pass the string type and the character to match as variables.

Regards,
Praneet

Posted 6-Oct-14 20:38pm

Praneet Nadkar

Comments

Maciej Los 7-Oct-14 2:53am

OP wants to know how many times each letter is repeated. If it is higher then 2, it should be enumerated.
Would you like to say we need to check each letter in alphabet?

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Maciej Los · Accepted Answer · 2014-10-06T20:45:00

Solution 2

Try this:

SQL

DECLARE @input VARCHAR(30) = 'Acabacaga'

;WITH CTE AS
(
    SELECT CONVERT(VARCHAR(1),LEFT(@input,1)) AS Letter, RIGHT(@input, LEN(@input)-1) AS Remainder
    WHERE LEN(@input)>1
    UNION ALL
    SELECT CONVERT(VARCHAR(1),LEFT(Remainder,1)) AS Letter, RIGHT(Remainder, LEN(Remainder)-1) AS Remainder
    FROM CTE
    WHERE LEN(Remainder)>1
    UNION ALL
    SELECT CONVERT(VARCHAR(1),Remainder) AS Letter, NULL AS Remainder
    FROM CTE
    WHERE LEN(Remainder)=1
)
SELECT Letter, ASCII(Letter) AS CharCode, COUNT(Letter) AS CountOfLetter
FROM CTE
GROUP BY Letter, ASCII(Letter)
HAVING COUNT(Letter)>2

Result:

Letter	CharCode	CountOfLetter
a			97			4

For further information, please see: Common Table Expressions[^]. In other words, CTE rocks!

Posted 6-Oct-14 20:45pm

Maciej Los

Comments

Thanks7872 7-Oct-14 3:18am

+5..!

Maciej Los 7-Oct-14 5:51am

Thank you ;)

rajshreelande 7-Oct-14 8:18am

THank you :)

Maciej Los 7-Oct-14 9:12am

You're welcome ;)

rajshreelande 21-Oct-14 9:35am

can u please suggest a query for dont allow three or more consicative letters in string .
EX:rahkkkff---dont allow

Maciej Los 21-Oct-14 15:20pm

There is nothing like query to disallow three or more consecutive letters in a string. It's possible to write query to find 3 or more consecutive letters. Please, post another question.

rajshreelande 22-Oct-14 1:59am

can u please write a query find 3 or more consecutive letters

Maciej Los 22-Oct-14 2:58am

The answer has been posted to the related question.

rajshreelande · Accepted Answer · 2014-10-09T21:31:00

ALTER FUNCTION [dbo].[CheckValidString]
(
@input varchar(50)

)
RETURNS varchar
AS
BEGIN

declare @inputLength integer = datalength(@input);
declare @intIndex integer = 1;
declare @intMaxCount integer = 3;
declare @singleChar Char(1);
declare @isValid Char(1);
while (1 = 1)
begin
if @intIndex > @inputLength
begin
select @isValid = 'Y';
break;
end

select @singleChar = substring(@input, @intIndex, 1)

if(@inputLength - datalength(replace(@input, @singleChar, '')) > @intMaxCount)
begin
select @isValid = 'N';
break;
end
select @intIndex += 1;
end

RETURN @isValid
END