SQL查询如何查找1月份（混合年份）最近几个月的数据SQL Server 2008

我正在创建一个查询以提取过去3个月的记录。我遇到的问题是，过去的x个月与前一年发生了冲突。我想我有办法，但我觉得有更好的办法

字段：asiplayer。使用的日期是一个日期时间字段

下面的代码似乎正在运行（但是我如何在7月份的1月份进行测试？）

有更好的办法吗？如果是最后6个月，我会继续这段代码吗

WHERE
-- ACTIVE LIST (LAST 3 MONTHS)
(

(   --Current Month is Not January or February, so all 3 months are in current year

        MONTH(CURRENT_TIMESTAMP) NOT IN (1,2) 
        AND MONTH(asiplayer.date_used) >= MONTH(DateAdd(month,-2,CURRENT_TIMESTAMP)) 
        AND YEAR(asiplayer.date_used) = YEAR(CURRENT_TIMESTAMP)
) 


    OR  --It's January so some of the months are last year

(           
        --Get November and December of the Previous Year    
        (MONTH(CURRENT_TIMESTAMP) = 1 AND   (MONTH(asiplayer.date_used) = MONTH(DateAdd(month,-2,CURRENT_TIMESTAMP)) OR MONTH(asiplayer.date_used) = MONTH(DateAdd(month,-1,CURRENT_TIMESTAMP)))
            AND YEAR(asiplayer.date_used) = YEAR(DateAdd(year,-1,CURRENT_TIMESTAMP))
        )

        OR  
            --Get January of the Current Year
            (MONTH(CURRENT_TIMESTAMP) = 1 
            AND MONTH(asiplayer.date_used) = 1 
            AND YEAR(asiplayer.date_used) = YEAR(CURRENT_TIMESTAMP)
            )

)   


    OR --It's February so some of the months are last year


(           
        --Get December of the Previous Year 
        (MONTH(CURRENT_TIMESTAMP) = 2 AND MONTH(asiplayer.date_used) = MONTH(DateAdd(month,-2,CURRENT_TIMESTAMP)) 
            AND YEAR(asiplayer.date_used) = YEAR(DateAdd(year,-1,CURRENT_TIMESTAMP))
        )

        OR  
            --Get January & February of the Current Year
            (MONTH(CURRENT_TIMESTAMP) = 2 
            AND MONTH(asiplayer.date_used) IN (1,2) 
            AND YEAR(asiplayer.date_used) = YEAR(CURRENT_TIMESTAMP)
            )

)   

)   

---

Serg提供了答案：

---

DATEDIFF（月，asiplayer.date_used，CURRENT_TIMESTAMP）DATEDIFF（月，asiplayer.date_used，CURRENT_TIMESTAMP）神圣的烟雾塞格，我感觉有一种更简单的方法，但不是那么简单！谢谢哎呀，我浪费了这么多代码和时间|是的，这是前几天发生的。