Question

我试图使用union来总结三个查询的计数。这些查询还包含其中的group by子句。以下是我写的查询：

select 
       extract(year from start_date), 
       extract(month from start_date),
       APPLICATION_TYPE,
       sum(TOTAL) as Overall_TOTAL
from (
select 
       extract(year from A.start_date) as Start_Year, 
       extract(month from A.start_date) as Start_Month,
       A.APPLICATION_TYPE as Type,
       count(A.TRANSACTION_NUMBER) as Total
from lnr_application A
where 
      A.START_DATE >= to_date('&sdate','DD/MM/YYYY')
      and A.START_DATE <= to_date('&edate','DD/MM/YYYY')  
      and A.permission_type = 'HRW'
      and A.status_cd in ('AP')
group by extract(year from start_date), extract(month from start_date), A.APPLICATION_TYPE
union all
select 
       extract (year from A.tstamp) as Start_Year, 
       extract (month from A.tstamp) as Start_Month, 
       A.application_type as Type,
       count(A.transaction_number) as Total
from lnr_application A
where 
      A.permission_type = 'HRW'
      and A.status_cd in ('RF')
      and trunc(A.tstamp) >= to_date ('&sdate','dd/mm/yyyy')
      and trunc(A.tstamp) <= to_date ('&edate','dd/mm/yy')
group by extract (year from A.tstamp), extract (month from A.tstamp), A.application_type 
union all
select 
       extract (year from A.tstamp) as Start_Year, 
       extract (month from A.tstamp) as Start_Month, 
       A.application_type as Type, 
       count(A.transaction_number) as Total
from lnr_application A
where 
      A.permission_type = 'HRW'
      and A.status_cd in ('CL')
      and trunc(A.tstamp) >= to_date ('&sdate','dd/mm/yyyy')
      and trunc(A.tstamp) <= to_date ('&edate','dd/mm/yy')      
group by extract (year from A.tstamp), extract (month from A.tstamp), A.application_type
) tmp
group by extract(year from start_date), extract(month from start_date), APPLICATION_TYPE
order by extract(year from start_date), extract(month from start_date), APPLICATION_TYPE

当我执行查询时，收到Start_Date是无效标识符的错误消息。如果我从顶部删除sum组件，即只联合所有三个查询，我得到以下结果：

2011    7   A   627 
2011    7   A   21 
2011    7   A   1 
2011    7   C   1585 
2011    7   C   1    
2011    7   I   1 
2011    7   I   154 
2011    7   I   3

我想总计各年，月和申请类型的总和，如下所示：

2011    7   A   649
2011    7   C   1586 
2011    7   I   158

有人可以帮帮我吗？

Answer 1

在union的SELECT语句中，您需要使用Start_Year和Start_Month而不是EXTRACT语句。此外，使用Type而不是Application_Type。

Answer 2

您可以将三个联合所有子查询合并为一个查询，然后您不需要额外的内联视图，从而导致这个简单的查询：

select extract(year from a.start_date)
     , extract(month from a.start_date)
     , a.application_type
     , sum(a.total) as overall_total
  from lnr_application a
 where a.permission_type = 'HRW'
   and a.status_cd in ('AP','RF','CL')
   and a.tstamp between to_date('&sdate','dd/mm/yyyy') and to_date('&edate','dd/mm/yyyy') + interval '1' day - interval '1' second
 group by extract(year from a.start_date)
     , extract(month from a.start_date)
     , a.application_type
 order by extract(year from a.start_date)
     , extract(month from a.start_date)
     , a.application_type

通过使用trunc（...，'mm'）而不是两次提取来简化更多：

select extract(year from trunc(a.start_date,'mm'))
     , extract(month from trunc(a.start_date,'mm'))
     , a.application_type
     , sum(a.total) as overall_total
  from lnr_application a
 where a.permission_type = 'HRW'
   and a.status_cd in ('AP','RF','CL')
   and a.tstamp between to_date('&sdate','dd/mm/yyyy') and to_date('&sdate','dd/mm/yyyy') + interval '1' day - interval '1' second
 group by trunc(a.start_date,'mm')
     , a.application_type
 order by trunc(a.start_date,'mm')
     , a.application_type

的问候，
罗布。

Answer 3

select 
       Start_Year, 
       Start_Month,
       APPLICATION_TYPE,
       sum(TOTAL) as Overall_TOTAL
from (
select 
       extract(year from A.start_date) as Start_Year, 
       extract(month from A.start_date) as Start_Month,
       A.APPLICATION_TYPE as Type,
       count(A.TRANSACTION_NUMBER) as Total
from lnr_application A
where 
      A.START_DATE >= to_date('&sdate','DD/MM/YYYY')
      and A.START_DATE <= to_date('&edate','DD/MM/YYYY')  
      and A.permission_type = 'HRW'
      and A.status_cd in ('AP')
group by extract(year from start_date), extract(month from start_date), A.APPLICATION_TYPE
union all
select 
       extract (year from A.tstamp) as Start_Year, 
       extract (month from A.tstamp) as Start_Month, 
       A.application_type as Type,
       count(A.transaction_number) as Total
from lnr_application A
where 
      A.permission_type = 'HRW'
      and A.status_cd in ('RF')
      and trunc(A.tstamp) >= to_date ('&sdate','dd/mm/yyyy')
      and trunc(A.tstamp) <= to_date ('&edate','dd/mm/yy')
group by extract (year from A.tstamp), extract (month from A.tstamp), A.application_type 
union all
select 
       extract (year from A.tstamp) as Start_Year, 
       extract (month from A.tstamp) as Start_Month, 
       A.application_type as Type, 
       count(A.transaction_number) as Total
from lnr_application A
where 
      A.permission_type = 'HRW'
      and A.status_cd in ('CL')
      and trunc(A.tstamp) >= to_date ('&sdate','dd/mm/yyyy')
      and trunc(A.tstamp) <= to_date ('&edate','dd/mm/yy')      
group by extract (year from A.tstamp), extract (month from A.tstamp), A.application_type
) tmp
group by Start_Year, 
       Start_Month,
       APPLICATION_TYPE
order by Start_Year, 
       Start_Month,
       APPLICATION_TYPE

尝试使用group by和union执行计数总和

3 个答案: