oracle 输出每个分组的第一行,该怎么解决

oracle 输出每个分组的第一行
ID Value
1 89
1 92
1 78
2 96
2 99
3 72
3 94
4 88
==========
输出结果
ID Value
1 89
2 96
3 72
4 88
输出结果是每一个分组的第一行，该如何写？

select ID,Value from tab_1

[解决办法]
select ID,Value from tab_1 group by id,Value;
[解决办法]

SQL code

select sub.id, sub.value from(with a as (select '1' as ID, '89' as value from dualunion allselect '1','92' from dualunion allselect '1','78' from dualunion allselect '2','96' from dualunion allselect '2','99' from dualunion allselect '3','72' from dualunion allselect '3','94' from dualunion allselect '4','88' from dual)select id,value,row_number() over (partition by id order by id) cnt from a) subwhere sub.cnt = 1;