Delete Records from table on the basis of inner join

Question

I have two tables in oracle DB called collection and collection_h. I have to delete all the records from collection_h which has the same below fields in the collection table.

I have to delete all the records from collection_h table that comes out as a result of the below query:

select * from collection inner join collection_h on
collection.pos_protocol_id  = collection_h.pos_protocol_id and
collection.terminal_pos_number = collection_h.terminal_pos_number and
collection.cb_file_number = collection_h.cb_file_number and
collection.cb_block_number = collection_h.cb_block_number and
collection.is_stan_batch = collection_h.is_stan_batch and
collection.is_transaction_date = collection_h.is_transaction_date and
collection.is_stan_trans = collection_h.is_stan_trans;

Answer 1

Delete where exists

delete
from collection as c
where exists (
  select 1
  from collection_h as h
  where h.pos_protocol_id  = c.pos_protocol_id
    and h.terminal_pos_number = c.terminal_pos_number 
    and h.cb_file_number = c.cb_file_number 
    and h.cb_block_number = c.cb_block_number 
    and h.is_stan_batch = c.is_stan_batch  
    and h.is_transaction_date = c.is_transaction_date
    and h.is_stan_trans = c.is_stan_trans
);

Simplified test on db<>fiddle here

But if the columns can have NULL's in the matching rows

delete
from collection as c
where exists (
  select 1
  from collection_h as h
  where decode(h.pos_protocol_id, c.pos_protocol_id, 0, 1) = 0
    and decode(h.terminal_pos_number, c.terminal_pos_number, 0, 1) = 0 
    and decode(h.cb_file_number, c.cb_file_number, 0, 1) = 0
    and decode(h.cb_block_number, c.cb_block_number, 0, 1) = 0
    and decode(h.is_stan_batch, c.is_stan_batch, 0, 1) = 0
    and decode(h.is_transaction_date, c.is_transaction_date, 0, 1) = 0
    and decode(h.is_stan_trans, c.is_stan_trans, 0, 1) = 0
);