分组不按预期工作

Question

需要帮助我的SQL查询

ActiveSheet.Range("$A$1:$C$29663").AutoFilter Field:=1, Criteria1:= _
    Worksheets("Sheet1").Range("B3").Value, Operator:=xlAnd, Criteria2:=Worksheets("Sheet1").Range("B4").Value

我的结果显示如下

请告诉我为什么国家电话没有分组。我想找到国内电话和国际电话的总和

Answer 1

在SQL下面使用：

select customer_id,
       call_details,
       sum(minutes) as minutes
from(
Select customer_id,
       if (call_details ='International' , 'International Calls', 'National Calls') as call_details,
       minutes
from call_minutes 
where date between '$from' and '$to') x 
group by customer_id,call_details

Answer 2

您不需要子查询，因为MySQL允许您在group by中使用列别名（并非所有数据库都这样做）。所以：

Select customer_id,
       (case when call_details = 'International'
             then 'International Calls'
             else 'National Calls'
        end) as call_group,
       sum(minutes) 
from call_minutes 
where date between '$from' and '$to' 
group by customer_id, call_group;

注意：这假设您希望每个客户都有单独的行。如果没有，请从customer_id和select：

中删除group by

Select (case when call_details = 'International'
             then 'International Calls'
             else 'National Calls'
        end) as call_group,
       sum(minutes) 
from call_minutes 
where date between '$from' and '$to' 
group by call_group;

如果您想要每个组中的客户ID列表，您可以随时添加group_concat(customer_id)。