Row_Numberとrankとdense_rank 順位や連番を求める 順位や連番を求めるのに使うのが、Row_Number関数とrank関数とdense_rank関数です。 create table RankingSample(ID,Score) as select 1,100 from dual union all select 1, 90 from dual union all select 1, 90 from dual union all select 1, 80 from dual union all select 1, 70 from dual union all select 2,100 from dual union all select 2,100 from dual union all select 2,100 from dual union all select