Need help in SQL query to get only distinct records

Question

Hi all.
I am new to oracle SQL and i want to write a query to get only distinct values from 2 tables.
for example i hade 2 tables table1(employee_id,employee_no,grade) and another table2 with same structure.
for example data in table1 is
Employeeid employeeno Grade
1 101 A
1 101 B
1 101 E
1 101 D
and data in table 2 is
Employeeid employeeno Grade
1 101 A
1 101 B
1 101 E
i want to display only the fourth row like the data that doesnt exist in table2 i,e (1 101 D)
I had too much records in both tables and i jst want to see the records that is in table 1 not in table 2 only.
employeeid and employeeno are the same in both tables
I hope u understand my query. I user left outer join and right outer join bt it displays all the results that and matching and unmatching. I want jst unmatched records.
Any help is highly Appreciated.
Thanx in Advance.
I am using oracle 10G on windows

Answer 1

Try MINUS:
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/queries004.htm#i2054381
SQL> -- generating sample data:
SQL> with t1 as (
  2  select 1 employeeid, 101 employeeno, 'A' grade from dual union
  3  select 1, 101, 'B' from dual union
  4  select 1, 101, 'E' from dual union
  5  select 1, 101, 'D' from dual
  6  )
  7  ,  t2 as (
  8  select 1 employeeid, 101 employeeno, 'A' grade from dual union
  9  select 1, 101, 'B' from dual union
10  select 1, 101, 'E' from dual
11  )
12  --
13  -- actual query:
14  --
15  select employeeid
16  ,      employeeno
17  ,      grade
18  from   t1
19  minus
20  select employeeid
21  ,      employeeno
22  ,      grade
23  from   t2;
EMPLOYEEID EMPLOYEENO G
         1        101 D
1 row selected.