SQLite Android获得不同的值

Question

我有一个SQLite数据库用于我的游戏关卡，数据来自Name, Campaign, Number, Score。在构建我的LevelList（带有自定义视图的ListView）时，我想从列表中选择一个Campaign，您可以在其中查看旁边的高分，这是通过在数据库中添加此广告系列级别的所有分数获得的。

数据库中的每个级别都有一个与其相关的广告系列字段。但要制作广告系列列表，我只希望获得不同的（独特的）广告系列。有没有从数据库中获取这些内容的好方法？
 获得这些的最佳方法是什么，并获得总分？

数据库的一部分以及我将如何制作我的levelpicker listview：

Answer 1

select * from gdata

 campain        num     name       file       score     player    
 -------------  ------  ---------  ---------  --------  --------- 
 Campain One    1       Level One  test1.xml  1221      john      
 Campain One    1       Level Two  test1.xml  122       john      
 Campain One    1       Level Two  test1.xml  122       dereck    
 Campain One    1       Level Two  test1.xml  122       jon       
 Campain Two    1       Level Two  test1.xml  122       jon       
 Campain Two    1       Level Two  test1.xml  122       jon       
 Campain Two    1       Level Two  test2.xml  122       jon       
 Campain Three  1       Level Two  test2.xml  1122      jon       
 Campain Three  1       Level Two  test2.xml  1122      jon       
 Campain Three  1       Level Two  test2.xml  1122      derekk  

---

select 'All' as campain ,'All'as player,sum(score) score from gdata
union
select campain,player,sum(score) as score from gdata group by campain,player

 campain        player     score    
 -------------  ---------  -------- 
 All            All        5319     
 Campain One    dereck     122      
 Campain One    john       1343     
 Campain One    jon        122      
 Campain Three  derekk     1122     
 Campain Three  jon        2244     
 Campain Two    jon        366      

---

select campain,sum(score) as score from gdata group by campain

 campain        score    
 -------------  -------- 
 Campain One    1587     
 Campain Three  3366     
 Campain Two    366   

---

select campain,player,max(score) from (
select campain,player,sum(score) as score from gdata 
group by campain,player order by score desc
) as b
group by campain  

 campain        player     score
 -------------  ---------  ------------- 
 Campain One    john       1343          
 Campain Three  jon        2244          
 Campain Two    jon        366