这主要是受上一个答案的启发,该答案有一些缺陷。
select max(next_x) from
(
select
count(case when y='B' then 1 end) over (order by x) correct,
count(case when y='G' then 1 end) over (order by x) wrong,
lead(x) over (order by x) next_x
from table_name
)
where correct/(correct + wrong) > 0.99
样本数据:
create table table_name(x number, y varchar2(1));
insert into table_name
select 2, 'B' from dual union all
select 3, 'B' from dual union all
select 3, 'B' from dual union all
select 4, 'B' from dual union all
select 5, 'B' from dual union all
select 5, 'B' from dual union all
select 5, 'B' from dual union all
select 6, 'G' from dual union all
select 7, 'B' from dual union all
select 7, 'B' from dual union all
select 7, 'B' from dual union all
select 8, 'B' from dual union all
select 8, 'B' from dual union all
select 8, 'B' from dual union all
select 12, 'G' from dual union all
select 12, 'G' from dual union all
select 12, 'G' from dual union all
select 12, 'G' from dual union all
select 12, 'G' from dual union all
select 12, 'G' from dual union all
select 12, 'G' from dual union all
select 12, 'G' from dual union all
select 13, 'G' from dual union all
select 13, 'G' from dual union all
select 13, 'B' from dual union all
select 13, 'G' from dual union all
select 13, 'G' from dual union all
select 13, 'G' from dual union all
select 13, 'G' from dual union all
select 13, 'G' from dual union all
select 14, 'B' from dual union all
select 14, 'G' from dual union all
select 14, 'G' from dual;