Updating the rows using a group by statement

Question

i have the following sql:
select a.lastname, count(*) from ga_to_sali_leads_wrk a
group by a.lastname, a.address1, a.address2, a.city, a.state
order by a.lastname, a.address1, a.address2, a.city, a.state
table ga_to_sali_leads_wrk has many more fields, two of which are ssn and relation_ssn; what i want to do is...for every record in the same group, update field relation_ssn to what's in the ssn field from the first record in the group;
for example; i have 3 records in the go_to_sali_leads_wrk table
ssn....relation_ssn.....lastname....address1....address2..city...state
123.....000.................wills...........12 main....................rose...ga
333.....000.................wills...........12 main....................rose...ga
465.....000.................wills...........12 main....................rose...ga
because the lastname, address1, address2, city and state are all the same, they are grouped together (i'm assuming they are the same family); i want the relation_ssn updated to contain "123" for all 3 records
Can i do that with an update statement? So far, the update statement hasn't worked.

Answer 1

SQL> update rt xx
  2  set relation_ssn =
  3  (select ssn from
  4          (select a.*, row_number() over(partition by
  5          a.lastname,a.address1,a.city,a.state order by
  6          a.lastname) rn from rt a)
  7  where rn = 1 and a.lastname = xx.lastname
  8  and a.address1=xx.address1 and a.city=xx.city
  9  and a.state=xx.state);
and a.state=xx.state)
ERROR at line 9:
ORA-00904: "A"."STATE": invalid identifier
SQL> desc rt
Name                                      Null?    Type
SSN                                                CHAR(3)
RELATION_SSN                                       CHAR(3)
LASTNAME                                           CHAR(5)
ADDRESS1                                           CHAR(2)
ADDRESS2                                           CHAR(4)
CITY                                               CHAR(4)
STATE                                              CHAR(2)Devmiral's sql don't use correlated inline view.
Best regards
Maxim