Sql 如何获得计数的滚动视图？

目标是统计从指定日期起三个月内符合标准的任何人。这（介于3个月之间）是一个棘手的部分。我在一个年度窗口内工作，从

getDate（）

开始不到3个月，我需要从Y开始不到3个月的时间。有什么想法吗

CREATE TABLE MONTH3LOOK AS Select 
to_CHAR(DATE_OF_SERVICE_3013,'YYYY-MM') "Date"

,COUNT(DISTINCT case when (regexp_instr(IS_CONCAT,'(2957|29570|29571|29572|29573|29574|29575|29576|29577|29578|29579)')>0)
 and 
 (DATE_OF_SERVICE_3013 between trunc(DATE_OF_SERVICE_3013,'MM') and add_months(trunc(DATE_OF_SERVICE_3013,'MM'),-3))
then USER end) AS Recip


FROM .NET_SERVICE
WHERE DATE_OF_SERVICE_3013 BETWEEN 
TO_DATE('2013-10','YYYY-MM') AND 
TO_DATE('2014-03','YYYY-MM')

group by to_CHAR(DATE_OF_SERVICE_3013,'YYYY-MM')

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由于包含group by运算符会干扰分析函数的操作，因此可能需要使用分析函数来获取计数和distinct运算符来模拟group by：

select distinct trunc(date_of_service_3013,'MM') "Date"
     , count(case when regexp_like(IS_CONCAT, '(1234|5678|etc)') then user end)
       over (order by trunc(date_of_service_3013, 'mm') 
             range between interval '3' month preceding 
                       and current row) recip
  from your_table
 where DATE_OF_SERVICE_3013 BETWEEN TO_DATE('2013-10','YYYY-MM')
                                AND TO_DATE('2014-03','YYYY-MM');

select trunc(date_of_service_3013,'MM') "Date"
     , sum(count(case when regexp_like(IS_CONCAT, '1234|5678|etc') then user end))
       over (order by trunc(date_of_service_3013, 'mm') 
             range between interval '3' month preceding 
                       and current row) recip
  from your_table
  group by trunc(date_of_service_3013,'MM')
 where DATE_OF_SERVICE_3013 BETWEEN TO_DATE('2013-10','YYYY-MM')
                                AND TO_DATE('2014-03','YYYY-MM');

考虑分组操作影响的另一种方法是更改分析函数和聚合函数的用法：

select distinct trunc(date_of_service_3013,'MM') "Date"
     , count(case when regexp_like(IS_CONCAT, '(1234|5678|etc)') then user end)
       over (order by trunc(date_of_service_3013, 'mm') 
             range between interval '3' month preceding 
                       and current row) recip
  from your_table
 where DATE_OF_SERVICE_3013 BETWEEN TO_DATE('2013-10','YYYY-MM')
                                AND TO_DATE('2014-03','YYYY-MM');

select trunc(date_of_service_3013,'MM') "Date"
     , sum(count(case when regexp_like(IS_CONCAT, '1234|5678|etc') then user end))
       over (order by trunc(date_of_service_3013, 'mm') 
             range between interval '3' month preceding 
                       and current row) recip
  from your_table
  group by trunc(date_of_service_3013,'MM')
 where DATE_OF_SERVICE_3013 BETWEEN TO_DATE('2013-10','YYYY-MM')
                                AND TO_DATE('2014-03','YYYY-MM');

这里，根据GROUPBY子句，聚合计数按月计算，然后使用分析总和将这些计数相加

关于这两种解决方案，where条款将阻止统计2013-10年之前的任何记录。如果您想在计数中包括2013-10年之前的记录，但只输出2013-10至2014-03年，则需要在

子功能查询块中使用上述两个查询中的任意一个，将t1作为（…）

子功能查询块，并适当调整开始日期，分两个阶段执行：

with t1 as (
select distinct trunc(date_of_service_3013,'MM') "Date"
     , count(case when regexp_like(IS_CONCAT, '1234|5678|etc') then user end)
       over (order by trunc(date_of_service_3013, 'mm') 
             range between interval '3' month preceding 
                       and current row) recip
  from your_table
 where DATE_OF_SERVICE_3013 BETWEEN TO_DATE('2013-07','YYYY-MM')
                                AND TO_DATE('2014-03','YYYY-MM')
)
select * from t1 where "Date" >= TO_DATE('2013-10','YYYY-MM');

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提供一些样本数据和预期输出，我们将尽力提供帮助。样本数据将在滚动月份汇总。因此，用户列将是X（其中X=在过去三个月内拥有IS_代码的用户），看起来您几乎从不接受基于您之前问题的任何答案。此外，这没有任何意义，请提供样本数据（解释您的情况），以帮助其他人了解您的问题。祝你好运