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group_concat in sql-server
CREATE table #tmp (Nummer int, Betreff varchar(32) null, Datum date null ); INSERT INTO #tmp SELECT 1,'2.000 EUR Rente','2017-03-06' UNION ALL SELECT 1,'2.000 EUR Rente',NULL UNION ALL SELECT 1,'2.000 Rente','2017-03-04' UNION ALL SELECT 1,'2.000 Rente','2017-02-02' UNION ALL SELECT 1,'2.000 Rente','2017-03-12' UNION ALL SELECT 1,'2.000 Rente','2017-02-19' UNION ALL SELECT 1,'2.000 Rente','2017-03-19' UNION ALL SELECT 1,'2.000 Rente','2017-02-27' UNION ALL SELECT 1,'2.000 Rente',NULL UNION ALL SELECT 1,'2.000 Rente','2017-02-27' UNION ALL SELECT 1,'2.000 Rente',NULL UNION ALL SELECT 2,'2.000 EUR Rente','2017-03-06' UNION ALL SELECT 2,'2.000 EUR Rente',NULL UNION ALL SELECT 2,'2.000 Rente','2017-03-04' UNION ALL SELECT 2,'2.000 Rente','2017-02-12' UNION ALL SELECT 2,'2.000 Rente','2017-03-12' UNION ALL SELECT 2,'2.000 Rente','2017-02-19' UNION ALL SELECT 2,'2.000 Rente','2017-03-29' UNION ALL SELECT 2,'2.000 Rente','2017-02-27' UNION ALL SELECT 2,'2.000 Rente',NULL UNION ALL SELECT 2,'2.000 Rente','2017-02-27' UNION ALL SELECT 2,'2.000 Rente',NULL; SELECT Nummer,min(Datum) miDat, max(Datum) maDat, STUFF( (SELECT ','+char(10) + CONVERT(char(10),Datum,104) FROM #tmp WHERE NOT Datum is null AND Nummer=o.Nummer ORDER BY Datum FOR XML PATH('')), 1, 2, '' ) as dates FROM #tmp o GROUP BY Nummer drop table #tmp
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