SQLite Android獲取不同的值

Question

我有一個SQLite數據庫用於我的遊戲級別，數據來自Name, Campaign, Number, Score。在構建我的LevelList（帶有自定義視圖的ListView）時，我想從列表中選擇一個Campaign，您可以在其中看到旁邊的高分，這是通過在數據庫中添加此廣告系列的所有分數獲得的。

數據庫中的每個級別都有一個它所屬的活動字段。但是爲了製作一個活動列表，我只想獲得獨特的（獨特的）活動。有沒有從數據庫中獲取這些數據的好方法？
獲得這些的最佳方式是什麼，並獲得總分？數據庫的

部分以及如何我要去把我levelpicker列表視圖：

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