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with tab( rid,id ) as ( select 800,161 from dual union all select 801,2 from dual union all select 802,2 from dual union all select 803,2 from dual union all select 804,156 from dual ), t2 as ( select t.*, lag(id,1,0) over (order by rid) lg from tab t ) select rid, id, sum(case when lg!=id then 1 else 0 end) over (order by rid) as row_num from t2;
RID
ID
ROW_NUM
800
161
1
801
2
2
802
2
2
803
2
2
804
156
3