Merge multiple rows into one column without duplicates

Question

I am working on a query that will collect data from a table and display the data for a report.

The data looks like this:

Player Score
001      10
001           


        

Answer 1

UPDATE AllNews 
    SET ArticleSource = pp.[NewsText]
  FROM AllNews AS an
  INNER JOIN (  select t1.Id,
  stuff((SELECT distinct '.' + t2.[Text]
           FROM NewsPhotos t2
           where t2.NewsId = t1.Id
           FOR XML PATH('')),1,1,'') as [NewsText]
             from AllNews t1
             group by t1.Id) as pp
  ON pp.Id = an.Id

Answer 2

A bit late and slightly off-topic as for another RDBMS, but I found this thread searching for a solution to this problem in Postgres. I found one, so if anyone else needs to solve this problem in Pg:

SELECT string_agg(DISTINCT <column>,'delimiter') FROM <table> GROUP BY <column2>

Answer 3

For SQL Server you can use:

select player,
  stuff((SELECT distinct ', ' + cast(score as varchar(10))
           FROM yourtable t2
           where t2.player = t1.player
           FOR XML PATH('')),1,1,'') 
from yourtable t1
group by player

Answer 4

Previous accepted answer is superseded in SQL 2017 and up by STRING_AGG:

SELECT Player, STRING_AGG(Score,', ') FROM YourTable GROUP BY Player

No need to use awkward FOR XML syntax.

I ran this and the accepted answer side-by-side on 100K rows. Accepted answer took 90 seconds, the STRING_AGG version takes less than 1 second.