訪問SQL查詢，返回從1和表6個計數根據日期

Question

很抱歉，如果這個問題已經被問過，我的數據庫表的結構是這樣的：

AgentName | Sold1 | SoldDate1 | Sold2 | SoldDate2 | Sold3 | SoldDate3 
Geoff  | True | 20/06/2012 | False | Null  | True | 20/04/2012 
Alex  | True | 13/02/2012 | True | 26/06/2012 | False | Null 

基本上，我試圖做的是算在過去的一個月中，有多少Geoff在Sold1中賣出了它，但首先它必須檢查sold1是否爲真，然後再次爲Sold2和Sold3檢查。

我的目標是，使AGENTNAME分組，並顯示爲返回的數據顯示：

AgentName  TotalSold1  TotalSold2  TotalSold3 

我希望有人能幫助我花了一整天試圖找到一個解決辦法:(

Answer 1

TABLE_NAME是表

select t0.AgentName, CountSold1, CountSold2, CountSold3 from (
    select distinct AgentName from table_name 
) t0 left join (
    select AgentName, count(*) CountSold1 from table_name 
    where Sold1 = 'True' and SoldDate1 between '01-JUN-2012' and '30-JUN-2012' 
    group by AgentName 
) t1 on t0.AgentName = t1.AgentName left join (
    select AgentName, count(*) CountSold2 from table_name 
    where Sold2 = 'True' and SoldDate2 between '01-JUN-2012' and '30-JUN-2012' 
    group by AgentName 
) t2 on t1.AgentName = t2.AgentName left join (
    select AgentName, count(*) CountSold3 from table_name 
    where Sold3 = 'True' and SoldDate3 between '01-JUN-2012' and '30-JUN-2012' 
    group by AgentName 
) t3 on t2.AgentName = t3.AgentName