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Comma Separated using SQL

Hello,

I've created a simple query that I have 3 or 4 records returned.

SELECT Distinct
at.Attachment_Filename AS attachment_files,
oh.Order_Number AS Order_Number
FROM dbo.Order_Detail od LEFT OUTER JOIN
dbo.Order_Header oh ON od.Order_Header_ID = oh.Order_Header_ID LEFT OUTER JOIN
dbo.Attachment at ON oh.Order_Header_ID = at.Order_Header_ID
WHERE  oh.Order_Number  =  '80237'

This returns
123456 | 80237
789012 | 80237
345678 | 80237

I'm needing results to show as
123456, 789012, 345678 | 80237

I'm running an older version of Vineyard Knowledgesync, and I believe it's using SQL 2005. So STUFF doesn't appear to work. Any help would be appreciated.
Thanks,

Hope this link helps you

Perhaps a more common use case is to group together and then aggregate, just like you would with SUM, COUNT or AVG.

We can use this SQL Query for example:

SELECT a.articleId, title, STRING_AGG (tag, ',') AS tags
FROM dbo.Article AS a
LEFT JOIN dbo.ArticleTag AS t
ON a.ArticleId = t.ArticleId
GROUP BY a.articleId, title;