Query list of tables using join between dba_tables and all_dependencies in oracle

Question

I have around 15000 tables in my oracle database. I want to primarily fetch list of such tables which are not in use, considering they are not appearing in all_dependencies by using join between dba_tables and all_dependencies.

What would be the query?

Answer 1

I am not sure if that's what you want , tables that does not exists in all_dependencies

select  t.table_name from all_tables t where t.table_name
 not in (select referenced_name from all_dependencies d where t.table_name=d.referenced_name and d.REFERENCED_TYPE='TABLE') 

Answer 2

Check this if it works for you..

SELECT *
  FROM dba_tables tb
 WHERE NOT EXISTS
              (SELECT 1
                 FROM all_dependencies dep
                WHERE     TB.OWNER = DEP.OWNER
                      AND TB.TABLE_NAME = DEP.REFERENCED_NAME
                      AND DEP.REFERENCED_TYPE = 'TABLE');

Answer 3

The query becomes like:

SELECT t.table_name
  FROM dba_tables t
 WHERE t.table_name NOT IN (SELECT d.referenced_name 
                              FROM dba_dependencies d
                             WHERE d.REFERENCED_TYPE = 'TABLE'
                             and d.referenced_name =  t.table_name)