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Get comma separated result of a database query
Posted By Sarin on Nov 30, 2012     RSS Feeds     Latest Hinduism news

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 ',' + 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 ',' + username
FROM UserInfo  where location='US' FOR XML PATH('')),2,200000) AS users
Alternatively, you can use the below query to do the same  
SELECT @listStr = COALESCE(@listStr+',' ,'') + username  
FROM UserInfo
SELECT @listStr as 'users'

Hope this tip was useful to you

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