Question

我想从2015年1月1日到2016年1月1日，按月从我们的数据库中获得每月的队列分析。它需要按月按位置显示。以下是我到目前为止的情况：

Select playsite_id, count([member_guid]) members,sum(TotalVisits) visitdiff                     
FROM                       
(SELECT playsite_id, member_guid,                      
         sum(case when [date_id] < 20150401            
                     then 1 
                     else null     
                     end) as PreviousVisits,    
       sum(case when [date_id] between 20150401 and 20150501                
                     then 1 
                     else null     
                     end) as CohortVisits,      
    sum(case when [date_id] between 20150401 and 20160401                         
                     then 1 
                     else null     
                     end) as TotalVisits  w
   FROM [Guest_Visit_Fact]                       
   where visit_type in ('WALK-IN NEW','WALK-IN REPEAT')              
   group by playsite_id, [member_guid]) as innertable                      
where PreviousVisits is null and CohortVisits > 0      
group by playsite_id

此代码仅适用于4月份。我们想知道是否有办法这样做，所以我们不必重写代码12次，每个月一次。也许我们过度思考它，我们已经碰壁了。这是代码返回的内容。因此，它显示了2015年4月至2016年4月期间，首次访问的访问者数量，以及返回的访问者数量。任何帮助，将不胜感激。我们已经很接近了。

Answer 1

尝试此查询

DECLARE @MonthStart INT, @YearStart INT ,@YearEnd INT 
SET @MonthStart=4
SET @YearStart=2015
SET @YearEnd=2016
WHILE @MonthStart <= 12 -- condition of months
BEGIN 
Select playsite_id, count([member_guid]) members,sum(TotalVisits) visitdiff                     
FROM                       
(SELECT playsite_id, member_guid,                      
         sum(case when MONTH([date_id]) <@MonthStart  AND YEAR([date_id])=@YearStart        
                     then 1 
                     else null     
                     end) as PreviousVisits,    
       sum(case when MONTH([date_id]) between @MonthStart and @MonthStart+1 and YEAR([date_id])= @YearStart               
                     then 1 
                     else null     
                     end) as CohortVisits,      
    sum(case when YEAR([date_id]) between @YearStart and @YearEnd AND MONTH([date_id]) = @MonthStart                       
                     then 1 
                     else null     
                     end) as TotalVisits  W
   FROM [Guest_Visit_Fact]                       
   where visit_type in ('WALK-IN NEW','WALK-IN REPEAT')              
   group by playsite_id, [member_guid]) as innertable                      
where PreviousVisits is null and CohortVisits > 0      
group by playsite_id 
SET @MonthStart=@MonthStart+1 
END
GO

我希望你工作

按月分组和SQL中的位置（SSMS）

1 个答案: