Oracle SQL : Retrieving non-existing values from IN clause

Question

Having following query:

select table_name
from user_tables
where table_name in (\'A\',\'B\',\'C\',\'D\',\'E\',\'F\');

Assuming only user_tables

Answer 1

if you have list of all those tables to be checked in Table1 then you can use NOT EXISTS clause

select name
from Table1 T1
where not exists ( select 1 from  
                   user_tables U
                   where T1.name = U.table_name)