PHP-Code:
SELECT A.DATUM, A.NAME, A.UMSATZ, S.SUMME
FROM Datei AS A
LEFT OUTER JOIN (
SELECT DATUM, MIN(NAME) AS NAME, SUM(UMSATZ) AS SUMME
FROM Datei
GROUP BY DATUM
ORDER BY DATUM) AS S
ON A.DATUM=S.DATUM AND A.NAME=S.NAME
ORDER BY A.DATUM, A.NAME DESC
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