Ett bra sätt att generera falska rader är med en standardsamling som 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