Oracle search list of words in string and retruen existing ones

Question

I am trying to write a statistic about the data warehouse tables that are used.

Therefor I should make a query to bring the used tables.

I have a list of table n

Answer 1

Here is the solution that I searched for:

WITH dwtables(dwtable) AS (
  SELECT 'DWA' FROM dual UNION ALL
  SELECT 'DWB' FROM dual UNION ALL
  SELECT 'DWC' FROM dual

)--> Tabelle mit einem Spalte (Liste)

SELECT title, 
    (SELECT LISTAGG (dwtable, ', ' ) WITHIN GROUP (ORDER BY dwtable)
     FROM dwtables
    WHERE REGEXP_LIKE (r.querytext, '(^|\s)'||dwtables.dwtable||'(\s|$)', 'i')) AS dwtables

 FROM Reports r;