Need to update multiple columns using another table

Question

I have 2 tables. and i need to update rows of 1 table using another table
Table1
Serial_no.     payment_date     Payment_amt
101     22/11/2010     150
101     18/03/2011      355
102     15/04/2011      488
103     20/05/2011      178
102     14/06/2011      269
101     28/06/2011      505
Table2
Serial_no     Charge_amt      Last_paymt_dt     Last_paymt_amt
101     255
102     648
103     475
I want to update Last_paymt_dt and Last_paymt_amt of table2 using Table1, I have written following update statement but it gives error that single row subquery return multiple row.
Update Table2
set (Last_paymt_dt,Last_paymt_amt) = (select max(payment_date, payment_amt) from table1
where table1.Serial_no = table2.Serial_no group by payment_amt)
kindly suggest how should i update.

Answer 1

SQL> select * from table1
  2  /
SERIAL_NO PAYMENT_DA PAYMENT_AMT
       101 22/11/2010         150
       101 18/03/2011         355
       102 15/04/2011         488
       103 20/05/2011         178
       102 14/06/2011         269
       101 28/06/2011         505
6 rows selected.
SQL> select * from table2
  2  /
SERIAL_NO CHARGE_AMT LAST_PAYMT LAST_PAYMT_AMT
       101        255
       102        648
       103        475
SQL> update  table2
  2     set  (last_paymt_dt,last_paymt_amt) = (
  3                                            select  max(payment_date),
  4                                                    max(payment_amt) keep(dense_rank last order by payment_date)
  5                                              from  table1
  6                                              where table1.serial_no = table2.serial_no
  7                                           )
  8  /
3 rows updated.
SQL> select * from table2
  2  /
SERIAL_NO CHARGE_AMT LAST_PAYMT LAST_PAYMT_AMT
       101        255 28/06/2011            505
       102        648 14/06/2011            269
       103        475 20/05/2011            178
SQL> SY.