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Madhivanan's TSQL Blog

Remove duplicate characters from a string

Dec 29 2007 7:05AM by Madhivanan   

Pinal Dave in his weblog posted about Remove Duplicate Chars From String Here is its alternate method with Number table approach 

create procedure remove_duplicate_characters(@string varchar(100))
as
Declare @result varchar(100)

set @result=''
select @result=@result+min(substring(@string ,number,1)) from 
( 
    select number from master..spt_values where type='p' and number between 1 and len(@string )) as t group by substring(@string,number,1)order by min(number)

select @result 

GO

Execute the procedure 

EXEC remove_duplicate_characters 'aasssarrrty' 

-- Result

asrty

Tags: t-sql, sql_server, string, duplicate,

Madhivanan
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1  Comments  

  • Hi I tried the above code with a small change, I declared the datatypes of the variable as varchar(max), but the output i am getting is wrong. I didn't understand what the problem is. When it is given size as 100 it is working correctly. Can you please help me. I want be more clear regarding this. The input string I provided is 'sireesha' and the output I am getting as 'a'.

    Thanks in advance, Naga Sireesha

    commented on May 3 2013 4:12AM
    NagaSireesha
    2893 · 0% · 2

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