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Concatenate column results to a string

select STUFF((SELECT N';' + TableColumnName 
FROM dbo.SrcTableName 
FOR XML PATH(''), TYPE).value('.[1]', 'nvarchar(max)'), 1, 2, N'')

 Or:

declare @StrList nvarchar(max) = ''
update dbo.SrcTableName 
set @StrList = @StrList+ isnull(TableColumnName, '') + ','
select @StrList=left(@StrList,len(@StrList)-1)
select @StrList

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