Question

我正在制作一份报告，展示他们参与的学生和活动。

报告请求每行需要一名学生。活动表每行有一个活动。我想做一个支点，但找不到办法。我没有知道可以使用的列，并且有超过五种活动类型。

对此的任何帮助将不胜感激。

示例表：

aaron    football
aaron    soccer
aaron    baseball
aaron    tennis
aaron    basketball
aaron    volleyball
steve    basketball
steve    swimming

示例输出：

 aaron    football    soccer    baseball    tennis    basketball
 steve    basketball  swimming

编辑：使用Oracle 11g

Answer 1

您必须为每项运动指定排名，然后应用PIVOT。

SQL Fiddle

Oracle 11g R2架构设置：

create table myt(
player varchar2(10),
sport varchar(20)
);

insert into myt values('aaron',  'football');
insert into myt values('aaron',  'soccer');
insert into myt values('aaron',  'baseball');
insert into myt values('aaron',  'tennis');
insert into myt values('aaron',  'basketball');
insert into myt values('aaron',  'volleyball');
insert into myt values('steve',  'basketball');
insert into myt values('steve',  'swimming');

with x(player, sport, r) as (
  select player, sport, row_number() over (partition by player order by null) r
  from myt
  )
select * from x
pivot(max(sport) for r in (
                1 as first, 
                2 as second, 
                3 as third, 
                4 as fourth, 
                5 as fifth
                          )
      )

<强> Results ：

| PLAYER |      FIRST |   SECOND |    THIRD | FOURTH |      FIFTH |
|--------|------------|----------|----------|--------|------------|
|  aaron |   football |   soccer | baseball | tennis | volleyball |
|  steve | basketball | swimming |   (null) | (null) |     (null) |

每个id旋转前五个结果

1 个答案: