Oracle查询以查找过去两个月内存在的客户ID

我在DB中有过去6个月的客户记录

select CN_NUMBER,ACCOUNT_NUMBER,TRNX_CREATED_DATE
from TRANSACTION_REPORTS t
/* a transaction in the previous month */
where trunc(last_day(t.TRNX_CREATED_DATE)) = trunc(last_day(add_months(sysdate, -1)))
  /* no transactions in this month */
  and NOT exists(
                  select 1
                  from TRANSACTION_REPORTS t2
                  where t2.ACCOUNT_NUMBER = t.ACCOUNT_NUMBER
                    and trunc(last_day(t2.TRNX_CREATED_DATE)) = trunc(last_day(sysdate))
                 )

目前，我已经创建了columnTRNX__DATE来确定交易何时完成

select CN_NUMBER,ACCOUNT_NUMBER,TRNX_CREATED_DATE
from TRANSACTION_REPORTS t
/* a transaction in the previous month */
where trunc(last_day(t.TRNX_CREATED_DATE)) = trunc(last_day(add_months(sysdate, -1)))
  /* no transactions in this month */
  and NOT exists(
                  select 1
                  from TRANSACTION_REPORTS t2
                  where t2.ACCOUNT_NUMBER = t.ACCOUNT_NUMBER
                    and trunc(last_day(t2.TRNX_CREATED_DATE)) = trunc(last_day(sysdate))
                 )

下面是我用来获取一个月的客户记录的查询

select distinct(CN_NUMBER),ACCOUNT_NUMBER,TRNX_CREATED_DATE from TRANSACTION_REPORTS 
where TRNX_CREATED_DATE>=add_months(trunc(sysdate,'mm'),-1) 

select CN_NUMBER,ACCOUNT_NUMBER,TRNX_CREATED_DATE
from TRANSACTION_REPORTS t
/* a transaction in the previous month */
where trunc(last_day(t.TRNX_CREATED_DATE)) = trunc(last_day(add_months(sysdate, -1)))
  /* no transactions in this month */
  and NOT exists(
                  select 1
                  from TRANSACTION_REPORTS t2
                  where t2.ACCOUNT_NUMBER = t.ACCOUNT_NUMBER
                    and trunc(last_day(t2.TRNX_CREATED_DATE)) = trunc(last_day(sysdate))
                 )

通过此查询，我可以获得上一个月的客户记录。我不知道如何获得本月新增的客户、最近两个月出现的客户或上个月出现但本月不再出现的客户

select CN_NUMBER,ACCOUNT_NUMBER,TRNX_CREATED_DATE
from TRANSACTION_REPORTS t
/* a transaction in the previous month */
where trunc(last_day(t.TRNX_CREATED_DATE)) = trunc(last_day(add_months(sysdate, -1)))
  /* no transactions in this month */
  and NOT exists(
                  select 1
                  from TRANSACTION_REPORTS t2
                  where t2.ACCOUNT_NUMBER = t.ACCOUNT_NUMBER
                    and trunc(last_day(t2.TRNX_CREATED_DATE)) = trunc(last_day(sysdate))
                 )

但是现在我想写三个独立的查询来完成下面的功能

select CN_NUMBER,ACCOUNT_NUMBER,TRNX_CREATED_DATE
from TRANSACTION_REPORTS t
/* a transaction in the previous month */
where trunc(last_day(t.TRNX_CREATED_DATE)) = trunc(last_day(add_months(sysdate, -1)))
  /* no transactions in this month */
  and NOT exists(
                  select 1
                  from TRANSACTION_REPORTS t2
                  where t2.ACCOUNT_NUMBER = t.ACCOUNT_NUMBER
                    and trunc(last_day(t2.TRNX_CREATED_DATE)) = trunc(last_day(sysdate))
                 )

在本月和上个月进行交易的客户。 在本月完成交易但在上个月未完成交易的客户。 本月未完成交易但上个月已完成交易的客户。

---

请建议。。提前感谢

有很多方法可以做到这一点；在下面，我试图给出一个可读的解决方案。

select CN_NUMBER,ACCOUNT_NUMBER,TRNX_CREATED_DATE
from TRANSACTION_REPORTS t
/* a transaction in the previous month */
where trunc(last_day(t.TRNX_CREATED_DATE)) = trunc(last_day(add_months(sysdate, -1)))
  /* no transactions in this month */
  and NOT exists(
                  select 1
                  from TRANSACTION_REPORTS t2
                  where t2.ACCOUNT_NUMBER = t.ACCOUNT_NUMBER
                    and trunc(last_day(t2.TRNX_CREATED_DATE)) = trunc(last_day(sysdate))
                 )

这解决了第一个问题：

select CN_NUMBER,ACCOUNT_NUMBER,TRNX_CREATED_DATE
from TRANSACTION_REPORTS t
/* a transaction in this month */
where trunc(last_day(t.TRNX_CREATED_DATE)) = trunc(last_day(sysdate)) 
  /* and a transaction in the previous month */
  and exists( select 1
              from TRANSACTION_REPORTS t2
              where t2.ACCOUNT_NUMBER = t.ACCOUNT_NUMBER
                and trunc(last_day(t2.TRNX_CREATED_DATE)) = trunc(last_day(add_months(sysdate, -1)))
             )

select CN_NUMBER,ACCOUNT_NUMBER,TRNX_CREATED_DATE
from TRANSACTION_REPORTS t
/* a transaction in the previous month */
where trunc(last_day(t.TRNX_CREATED_DATE)) = trunc(last_day(add_months(sysdate, -1)))
  /* no transactions in this month */
  and NOT exists(
                  select 1
                  from TRANSACTION_REPORTS t2
                  where t2.ACCOUNT_NUMBER = t.ACCOUNT_NUMBER
                    and trunc(last_day(t2.TRNX_CREATED_DATE)) = trunc(last_day(sysdate))
                 )

第二个非常类似，您只需要一点布尔逻辑：

select CN_NUMBER,ACCOUNT_NUMBER,TRNX_CREATED_DATE
from TRANSACTION_REPORTS t
/* a transaction in this month */
where trunc(last_day(t.TRNX_CREATED_DATE)) = trunc(last_day(sysdate))
  /* no transactions in the previous month */
  and NOT exists(
                  select 1
                  from TRANSACTION_REPORTS t2
                  where t2.ACCOUNT_NUMBER = t.ACCOUNT_NUMBER
                    and trunc(last_day(t2.TRNX_CREATED_DATE)) = trunc(last_day(add_months(sysdate, -1)))
                 ) 

select CN_NUMBER,ACCOUNT_NUMBER,TRNX_CREATED_DATE
from TRANSACTION_REPORTS t
/* a transaction in the previous month */
where trunc(last_day(t.TRNX_CREATED_DATE)) = trunc(last_day(add_months(sysdate, -1)))
  /* no transactions in this month */
  and NOT exists(
                  select 1
                  from TRANSACTION_REPORTS t2
                  where t2.ACCOUNT_NUMBER = t.ACCOUNT_NUMBER
                    and trunc(last_day(t2.TRNX_CREATED_DATE)) = trunc(last_day(sysdate))
                 )

第三个，你只需要交换条件：

select CN_NUMBER,ACCOUNT_NUMBER,TRNX_CREATED_DATE
from TRANSACTION_REPORTS t
/* a transaction in the previous month */
where trunc(last_day(t.TRNX_CREATED_DATE)) = trunc(last_day(add_months(sysdate, -1)))
  /* no transactions in this month */
  and NOT exists(
                  select 1
                  from TRANSACTION_REPORTS t2
                  where t2.ACCOUNT_NUMBER = t.ACCOUNT_NUMBER
                    and trunc(last_day(t2.TRNX_CREATED_DATE)) = trunc(last_day(sysdate))
                 )

---

请提供您到目前为止尝试的信息。我已经更新了其他信息，请建议。为什么使用mysql标签？谢谢@Aleksej，上面的查询解决了我的要求。