I think there might be a small typo though. The left-join is to:
   (select uid, phone_numer, datum from t2 order by 2 )
Probably want to order by "datum DESC" too, to ensure you get the latest
dates for each telnum.


yes, I also observed this, so I have add to my query.

Thank you for your explanations, Richard.


Best regards,
      Loredana

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