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Working with delimited strings in T-SQL

Two examples of the the problems that you may face while working with strings in T-SQL.

There may be cases where you want to work with delimited strings in T-SQL. The following two examples will cover...

some of the problems that you will face while working with strings.

Find the count of words in a comma delimited string:

declare @mystring varchar(200) 
set @mystring="vb,asp,sqlserver,html" 
select (len(@mystring)-len(replace(@mystring,',',''))+1) 

Parsing the delimited string:

--variable i is for current and j for previous locations 
DECLARE @mystring varchar(255), @myword varchar(50) 
DECLARE @i int,@j int 
SELECT @mystring = 'vb,asp,sqlserver,html' 
SELECT @i = 0,@j = 0 
IF SUBSTRING (@mystring, LEN (@mystring), 1) <> ',' 
BEGIN 
   SELECT @mystring = @mystring + ',' 
END 
SELECT @i = CHARINDEX (',', @mystring, @i + 1) 
WHILE @i > 0 
BEGIN 
   SELECT @myword = SUBSTRING (@mystring, @j+1, (@i - @j) -1) 
   SELECT @myword 
   SELECT @j = @i 
   SELECT @i = CHARINDEX (',' , @mystring, @i + 1) 
END 

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This was last published in October 2001

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