Comparing records in duplicate tables in different oracle databases

Question

I have the same table in two oracle databases. One is a staging database that has it\'s record loaded into the primary. I want to go through the staging table and see if there a

Answer 1

Something like this should work

delete from stagingtable
where id in
(select id
from stagingtable st join productiontable pt on st.id = pt.id
and st.nextfield = pt.nextfield
etc
)

Answer 2

To get the ones where something has changed you can use:

SELECT * FROM "staging_table"
MINUS
SELECT * FROM "table";

So, assuming that the table has a primary key then you can do

DELETE FROM "table"
WHERE primary_key_column
      NOT IN 
      ( SELECT primary_key_column
        FROM (
          SELECT * FROM "staging_table"
          MINUS
          SELECT * FROM "table"
        )
      );