如何按1个字段分组

Question

我在oracle上查询，结果如下：

---

sportsman1 coach1 result_of_function

sportsman1 coach2 result_of_function

sportsman2 coach3 result_of_function

---

但是我需要像这样：

---

sportsman1

coach1 result_of_function

coach2 result_of_function

sportsman2

coach3 result_of_function

---

select  a.fullname as Sportsman, t.fullname as Coach, date_raz(a.dateinclub, b.dateovertrain) as MONTHS
from athlet a, trainer t,black_couch b
where t.id=a.couch and b.couch=t.id and b.athlete=a.id;

我应该在查询中添加什么？