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Get comma separated result of a database query
Posted By Sarin on Nov 30, 2012     RSS Feeds     Latest Hinduism news
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Sometimes you may have the requirement to display the result of the database query as a comma separated values. For example in a blogging website, you may want to show the list of comma separated users who liked a particular article.
 
As an example, below query gets the list of all users from userinfo table
  
SELECT SUBSTRING(
(SELECT ',' + username
FROM UserInfo FOR XML PATH('')),2,200000) AS users
  
Below is the output of this query. I have three users in my sample database and as you can see below, all his three users are shown in a single column as comma separated values.


  
You can also add a Filter condition as
SELECT SUBSTRING(
(SELECT ',' + username
FROM UserInfo  where location='US' FOR XML PATH('')),2,200000) AS users
  
Alternatively, you can use the below query to do the same  
DECLARE @listStr VARCHAR(MAX)
SELECT @listStr = COALESCE(@listStr+',' ,'') + username  
FROM UserInfo
SELECT @listStr as 'users'

Hope this tip was useful to you
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