Voeg de tweede kolomwaarde samen als de eerste kolomwaarde hetzelfde is

Gebruik Listagg() in 11g of WM_Concat() in 10g:

   SELECT LISTAGG(TITLE_OF_DOC_SEC, ',') WITHIN GROUP (ORDER BY TRACKING_NUM) AS TITLE_OF_DOC_SEC 
     FROM your table
    WHERE....

   SELECT WM_CONCAT(TITLE_OF_DOC_SEC) AS TITLE_OF_DOC_SEC
     FROM your table
    WHERE....