Mysql sql中不重复的组合

用例：

表名称：团队。它有1列“国家/地区”

现在我需要创建一个新表，其中包含两列“team1”和“team2”，用于生成匹配项

例如：

Team1     Team2        
Ind       Lanka
Ind       Aus

忽略create table和insert table查询，下面是我的select查询以完成此操作：

SELECT distinct
s1.Country as sk, 
s2.Country as sk2
from Teams s1 cross join Teams s2
where sk <> sk2

---

但在场景中，这是两个相同的匹配项。如果您对如何纠正此错误有任何建议，我们将不胜感激。

使用

您希望查询结果中每个团队（国家）都有一次结果？
SELECT distinct
s1.Country as sk, 
s2.Country as sk2
from Teams s1 cross join Teams s2
where sk <> sk2

Team1     Team2
India      Aus
Aus        India

select s1.Country as sk, s2.Country as sk2
from Teams s1 join
     Teams s2
     on s1.sk < s2.sk;

select distinct s1.Country as sk, s2.Country as sk2
from Teams s1 join
     Teams s2
     on s1.sk < s2.sk;