如何使用条件从sql表中删除重复项

我有下面的sql表，我想在对象id与团队名称匹配时删除重复的条目。基本上，我想要对象的唯一值

我想将上表转换为如下所示

session_id  object_id   team_name   user_name   user_desc
----------  ---------   ---------   ---------   -----------------
session1    user1       team1       user1       user1_description
session1    user2       team1       user2       user2_description
session1    team1       team1       null        null

---

如何实现这一点？

如果我理解正确，您可以使用聚合：

select (case when min(session_id) = max(session_id) then min(session_id) end) as session_id,
       object_id,
       (case when min(team_name) = max(team_name) then min(team_name) end) as team_name,
       (case when min(user_name) = max(user_name) then min(user_name) end) as user_name,
       (case when min(user_desc) = max(user_desc) then min(user_desc) end) as user_desc
from t
group by object_id;

这里的团队id是什么？在模式中没有提到它

select (case when min(session_id) = max(session_id) then min(session_id) end) as session_id,
       object_id,
       (case when min(team_name) = max(team_name) then min(team_name) end) as team_name,
       (case when min(user_name) = max(user_name) then min(user_name) end) as user_name,
       (case when min(user_desc) = max(user_desc) then min(user_desc) end) as user_desc
from t
group by object_id;