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

A good way to generate fake rows is with a standard collection such as sys.odcivarchar2list:

select
    tables_to_check.table_name,
    case when user_tables.table_name is null then 'No' else 'Yes'end table_exists
from
(
    select column_value table_name
    from table(sys.odcivarchar2list('does not exist', 'TEST1'))
) tables_to_check
left join user_tables
    on tables_to_check.table_name = user_tables.table_name
order by tables_to_check.table_name;


TABLE_NAME       TABLE_EXISTS
----------       ------------
TEST1            Yes
does not exist   No