Concat the second column value if the first column value is same

Question

I have a query like below and listed output of it:

SELECT DISTINCT TRACKING_NUM,TITLE_OF_DOC_SEC 
FROM some_table  
WHERE  TRACKING_NUM IS NOT NULL;
<         


        

Answer 1

If you are using Oracle 11g+, then you can use LISTAGG():

SELECT TRACKING_NUM,
  LISTAGG(TITLE_OF_DOC_SEC, ', ') WITHIN GROUP (ORDER BY TRACKING_NUM) AS TITLE_OF_DOC_SEC 
FROM some_table  
WHERE  TRACKING_NUM IS NOT NULL
GROUP BY TRACKING_NUM;

See SQL Fiddle with Demo