Simple SQL Query Output

Question

Table1:
ID      EMPNAME COUNTRY
101     XYZ     USA
102     ABC     UK
103     XYZ     USA
104     ABC     UK
Required output:
ID      EMPNAME COUNTRY CALCULATED_VALUE
101     XYZ     USA     1
102     ABC     UK     1
103     XYZ     USA     0
104     ABC     UK     0
Every 1st record of (EMPNAME, COUNTRY) combination should have CALCULATED_VALUE =1 and all succeeding records of same (EMPNAME, COUNTRY) combination should have CALCULATED_VALUE =0

Answer 1

Try this ->
scott>
scott>select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE    10.2.0.1.0      Production
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
Elapsed: 00:00:00.02
scott>
scott>
scott>with t
  2  as
  3    (
  4      select 101 ID, 'XYZ' EMPNAME, 'USA' COUNTRY from dual
  5      union all
  6      select 102, 'ABC', 'UK' from dual
  7      union all
  8      select 103, 'XYZ', 'USA' from dual
  9      union all
10      select 104, 'ABC', 'UK' from dual
11    )
12  select ID,
13         EMPNAME,
14         COUNTRY,
15         case
16           when rn = 1 then
17             1
18         else
19           0
20         end CALCULATED_VALUE
21  from (
22         select ID,
23                EMPNAME,
24                COUNTRY,
25                row_number() over(partition by COUNTRY order by ID) rn
26         from t
27       )
28  order by ID;
        ID EMP COU CALCULATED_VALUE
       101 XYZ USA                1
       102 ABC UK                 1
       103 XYZ USA                0
       104 ABC UK                 0
Elapsed: 00:00:00.00
scott>Regards.
Satyaki De.