How to Update records of one oracle table from another table when there may be 1:N relationships.

I am trying to set a date in one table based on data in another.

The code I am using is as follows:
update &2 a
set a.ret_date =
 (select b.ret_date
 from &3 b
 where  a.pcode=b.pcode and
   a.pctype=b.pctype and
   a.lowaddr=b.lowaddr and
   a.highaddr=b.highaddr and
   a.std_stname=b.std_stname and
   a.std_sttype=b.std_sttype and
   a.std_stdir=b.std_stdir and
   a.std_comm_name=b.std_comm_name and
   (a.pctype like '1' or a.pctype like '2')
   );
There are cases where there is a one to one match between the tables based on the criteria,
but there are also cases where table &2 may have multiple records that match.

How can I update all the matching records in table &2, not just the first match?