LISTAGG - ORACLE

SELECT
    A1.AUFTRAGSNUMMER AS "Order number", A1.AEXTERNAUFTRAGSNR AS "Client reference", SKUNDEN.NAME1 AS "Client name", SKUNDEN.MAINLAND AS "Country of the client",
    SHIER.NR AS "Number of organisation", SHIER.BEZEICHNUNG AS "Name of organisation", LISTAGG(AT.TOURNUMMER, ', ') WITHIN GROUP (ORDER BY AT.TOURNUMMER) AS "Tour numbers",
    TO_CHAR(MIN(ATASEND.VONLADEDATUM), 'DD-MM-YYYY') AS "First loading date"
FROM AKOPF A1
LEFT JOIN SHIERARCHIE SHIER ON SHIER.ID = A1.HIERARCHIE
LEFT JOIN ASENDUNG ON A1.NR = ASENDUNG.AKOPFNR
LEFT JOIN ATASEND ON ATASEND.ASENDUNGID = ASENDUNG.SENDUNGID
LEFT JOIN ATOUR AT ON AT.NR = ATASEND.TOURNR
LEFT JOIN SKUNDEN ON SKUNDEN.NR = A1.FRACHTAGNR

WHERE (AT.LKWKZ IS NOT NULL OR AT.ANHAENGERKZ IS NOT NULL) AND A1.AUFTRAGSNUMMER IN (908243, 220785)

GROUP BY A1.AUFTRAGSNUMMER, A1.AEXTERNAUFTRAGSNR, SKUNDEN.NAME1, SKUNDEN.MAINLAND, SHIER.NR, SHIER.BEZEICHNUNG
ORDER BY MIN(ATASEND.VONLADEDATUM) ASC;