How to select all possible values of columns from all tables?

Question

SELECT POM.TABLE_NAME, POM.COLUMN_NAME
FROM ALL_TAB_COLUMNS POM
WHERE  POM.COLUMN_NAME LIKE'%STATUS%'

I want to see all possible values in columns on the list(in one row if possible). How can i modify this select to do it?

i want soemthing like this

 TABLE_NAME | COLUMN_NAME |VALUES
 -----------| ----------- | -------
 CAR        | COLOR       | RED,GREEN 

Answer 1

You can use the below query for your requirement. It fetched distinct column values for a table. It can be used only for the table having limited number of distinct values as I have used LISTAGG function.

SELECT POM.TABLE_NAME, POM.COLUMN_NAME,
       XMLTYPE(DBMS_XMLGEN.GETXML('SELECT LISTAGG(COLUMN_NAME,'','') WITHIN GROUP (ORDER BY COLUMN_NAME) VAL 
                                   FROM (SELECT DISTINCT '|| POM.COLUMN_NAME ||' COLUMN_NAME
                                         FROM '||POM.OWNER||'.'||POM.TABLE_NAME||')')
              ).EXTRACT('/ROWSET/ROW/VAL/text()').GETSTRINGVAL() VAL
FROM   ALL_TAB_COLUMNS POM
WHERE  POM.COLUMN_NAME LIKE'%STATUS%';