How to use primary key in sql combined from 2 columns

Question

table1
primary key = orderid+custname
orderid custname address
8889 Adrian london
8867 Clara manchester
2229 Peter warwick
table2
primary key = orderid+custname
orderid custname qty price
8889 Adrian 10 2500
8865 Adrian 20 9483
8867 Clara 30 3993
5869 Clara 15 1828
2290 Peter 10 2102
2298 Peter 13 3839
then how do i query ?
SQL> select t1.orderid, t1.custname, t1.address, t2.qty, t2.price from
table1 t1, table2 where ? = ?
what's the "?" should be ????
it doesn't work if i enter the primary constraint key for each table.
thanks.

Answer 1

thanks, it works ;)
btw, do you know how about the date field ?
what if one of the field in table1 is 12/12/2005 14:30
and table2 is 15/12/2005
table1
orderid orderdate
1234 12/12/2005 14:30
2234 15/12/2005 13:45
table2
orderid orderdate
1234 12/12/2005
2234 15/12/2005
so the query
select t1.orderid as t1 t1.orderdate , t2.orderid as t2, t2.orderdate from
table1 t1, table2 t2 where t1.orderid = t2.orderid
and to_char(to_date(t1.orderdate, 'dd/mm/yyyy hh24:mi'), 'dd/mm/yyyy') = t2.orderdate
thanks.