1.准备建表和数据

create table u
(
 uname  varchar2(100),
 dt     date
);

insert into u values('张三',  date'2024-1-1');
insert into u values('张三',  date'2024-1-3');
insert into u values('张三',  date'2024-1-4');
insert into u values('李四',  date'2024-1-4');
insert into u values('李四',  date'2024-1-5');
insert into u values('李四',  date'2024-1-8');
insert into u values('李四',  date'2024-1-11');
insert into u values('王五',  date'2024-1-1');
insert into u values('王五',  date'2024-1-2');
insert into u values('王五',  date'2024-1-3');
commit;

2.查询

select uname from
(
  select uname, dt,
         dt - row_number()over(partition by uname order by dt) as r
    from u
)
group by uname, r
having count(1) >= 3;