SQLite Android获取不同的值

Question

我有一个SQLite数据库用于我的游戏级别，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，您可以在其中看到旁边的高分，这是通过在数据库中添加此广告系列的所有分数获得的。

数据库中的每个级别都有一个它所属的活动字段。但是为了制作一个活动列表，我只想获得独特的（独特的）活动。有没有从数据库中获取这些数据的好方法？
获得这些的最佳方式是什么，并获得总分？数据库的

部分以及如何我要去把我levelpicker列表视图：

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