Oracle Replace function

Question

I need to replace the Table1\'s filed values from Table2\'s values while select query.

Eg:

Table1:

Org                  Permission
--------------         


        

Answer 1

If you don't want to update the existing table and only want to select the data then you can use this somewhat laborious query.

http://sqlfiddle.com/#!4/22909/4

WITH changed_table AS
     (SELECT val1, EXTRACTVALUE (x.COLUMN_VALUE, 'e') val2new
        FROM (SELECT val1, val2 xml_str
                FROM table1),
             TABLE (XMLSEQUENCE (XMLTYPE (   ''
                                          || REPLACE (xml_str, ',', '')
                                          || ''
                                         ).EXTRACT ('e/e')
                                )
                   ) x)
SELECT ct.val1, listagg(table2.val2,',') within group (order by table2.val2) val2
  FROM changed_table ct, table2 table2
 WHERE ct.val2new = table2.val1
group by ct.val1;

I have used the XMLTYPE to separate the comma separated numbers to rows. Then joined the rows with second table to get the description and finally used the LISTAGG function to form comma separated string. Don't know how efficient this query is. I agree with Mark Bannister's comment.