Sql 如何正确使用完全外部联接的结果？

假设以下简化情况：

生日派对上提供两种游戏（飞镖和保龄球）。每场比赛每位客人的分数存储在单独的表格中：

Darts:                         Bowling:
Name  | Dart-Score             Name  | Bowling-Score
------------------             --------------------
Alice |  120                   Bob   | 25
Tim   |   90                   Alice |  8

现在，我想像这样连接表（按名称排序）：

我的做法如下：

select *
from Darts d full outer join Bowling b on (d.Name=b.Name)
order by Name;

这显然会引发错误，因为在联接表中，

Name

是不明确的：

Darts.Name  | Dart-Score | Bowling.Name | Bowling-Score
-------------------------------------------------------
Alice       | 120        | Alice        | 8
Tim         | 90         | NULL         | NULL
NULL        | NULL       | Bob          | 25

此外，我不能订购，例如Darts.Name，因为有些值是

NULL

。那么，如何按照

完全外部联接的联接属性对结果进行排序呢？或者在这种情况下，
外部连接是错误的方法吗

我的解决方案：

感谢@jarlh和@Radu Gheorghiu，我使用了以下查询：

select coalesce(d.Name,b.Name) Names, Dart-Score, Bowling-Score
from Darts d full outer join Bowling b on (d.Name=b.Name)
order by Names;

您可以通过
NVL（d.Name，b.Name）
或
COALESCE（d.Name，b.Name）
由于是完全联接，其中一列将有一个名称。通过使用
NVL（）
您将始终获得非空结果

在这种情况下，
外部连接
是正确的方法
或者，您可以在内部创建一个完整的名称列表，并使用这两个表中的每个表进行
左连接
，以在输出中创建一个公共
名称
列

select a.Name, d.Dart-Score, b.Bowling-Score
from 
(select name from Darts 
 UNION 
 select name from Bowling) a
LEFT JOIN
Darts d on a.Name = d.Name 
LEFT JOIN
Bowling b on a.Name = b.Name
ORDER BY a.Name;

ORDER BY
可应用于联合列表。
根据以下和执行查询：

--首先在查询中联合所有值并按名称分组：

create table Darts(id integer, Name  varchar(25), DartScore integer);
create table Bowling(id integer, Name  varchar(25), BowlingScore integer);

insert into Darts  values(1, 'Alice',120);
insert into Darts  values(1, 'Tim',90);

insert into Bowling  values(1, 'Bob',25);
insert into Bowling  values(1, 'Alice',8);


select name, DartScore, NULL as  BowlingScore from Darts
union all 
select name, NULL as DartScore,  BowlingScore from  Bowling;

select name, SUM(DartScore) as DartScore from Darts group by name;

select name, SUM(DartScore) as DartScore, SUM(BowlingScore) as BowlingScore 
from (
select name, DartScore, NULL as  BowlingScore from Darts
union all 
select name, NULL as DartScore,  BowlingScore from  Bowling
) 
group by name;

选择合并（d.Name，b.Name）.
create table Darts(id integer, Name  varchar(25), DartScore integer);
create table Bowling(id integer, Name  varchar(25), BowlingScore integer);

insert into Darts  values(1, 'Alice',120);
insert into Darts  values(1, 'Tim',90);

insert into Bowling  values(1, 'Bob',25);
insert into Bowling  values(1, 'Alice',8);


select name, DartScore, NULL as  BowlingScore from Darts
union all 
select name, NULL as DartScore,  BowlingScore from  Bowling;

select name, SUM(DartScore) as DartScore from Darts group by name;

select name, SUM(DartScore) as DartScore, SUM(BowlingScore) as BowlingScore 
from (
select name, DartScore, NULL as  BowlingScore from Darts
union all 
select name, NULL as DartScore,  BowlingScore from  Bowling
) 
group by name;