从 Oracle 中的季度日期填充每月日期

Question

我在 FACT table 中的值如下：

As of Date  F_Type      Value
31-Mar-17   ABC Corp    1.0
30-Jun-17   ABC Corp    1.1

由于日期是季度结束日期，现在我需要编写一个查询来获取如下结果集：（值更改后的日期之间的月结束日期）

As of Date  F_Type      Value
31-Mar-17   ABC Corp    1.0
30-Apr-17   ABC Corp    1.0
31-May-17   ABC Corp    1.0
30-Jun-17   ABC Corp    1.1

如何填充 2017 年 4 月 30 日和 17 年 5 月 31 日的行？

到目前为止尝试过的代码：

SELECT 
As_Of_Date,
F_Type,
Value,X.*
FROM FACT F INNER JOIN
(SELECT M_DATE,trunc(M_DATE+1,'Q')-1 AS QTR_DATE FROm
(Select TO_DATE('31-JAN-2017','DD-MON-YYYY') AS M_DATE from dual UNION ALL
Select TO_DATE('28-FEB-2017','DD-MON-YYYY') from dual UNION ALL
Select TO_DATE('31-MAR-2017','DD-MON-YYYY') from dual UNION ALL
Select TO_DATE('30-APR-2017','DD-MON-YYYY') from dual UNION ALL
Select TO_DATE('31-MAY-2017','DD-MON-YYYY') from dual UNION ALL
Select TO_DATE('30-JUN-2017','DD-MON-YYYY') from dual UNION ALL
Select TO_DATE('31-JUL-2017','DD-MON-YYYY') from dual UNION ALL
Select TO_DATE('31-AUG-2017','DD-MON-YYYY') from dual UNION ALL
Select TO_DATE('30-SEP-2017','DD-MON-YYYY') from dual UNION ALL
Select TO_DATE('31-OCT-2017','DD-MON-YYYY') from dual UNION ALL
Select TO_DATE('30-NOV-2017','DD-MON-YYYY') from dual UNION ALL
Select TO_DATE('31-DEC-2017','DD-MON-YYYY') from dual ) )X
ON F.As_Of_Date=X.QTR_DATE

这给了我如下内容：

As of Date  F_Type      Value   M_Date   Qtr_Date
3/31/2017   ABC Corp    1.0   3/31/2017  3/31/2017
3/31/2017   ABC Corp    1.0   4/30/2017  3/31/2017
3/31/2017   ABC Corp    1.0   5/31/2017  3/31/2017
6/30/2017   ABC Corp    1.1   6/30/2017  6/30/2017
6/30/2017   ABC Corp    1.1   7/31/2017  6/30/2017
6/30/2017   ABC Corp    1.1   8/31/2017  6/30/2017

有没有办法调整这个查询和输出。

Answer 1

我认为以下查询可能适合您，我尝试了您的 table 并检查了输出。

 SELECT * FROM FACT
 UNION
 SELECT ADD_MONTHS(AS_OF_DATE,LVL.LVL2) DT,
          FACT.F_TYPE,
          FACT.VALUE
 FROM FACT,
       (SELECT LEVEL AS LVL2
         FROM DUAL
          CONNECT BY LEVEL<=2) LVL
         ,(SELECT  MAX(AS_OF_DATE) DT2 
          FROM FACT) FC2 
      WHERE ADD_MONTHS(AS_OF_DATE,LVL.LVL2)<=FC2.DT2

我取了下面的数据集：

As of Date  F_Type      Value
31-Mar-17   ABC Corp    1.0
30-Jun-17   ABC Corp    1.1
30-Sep-17   ABC Corp    1.2

添加了 Sep 行以测试我的查询的真实性。

我得到的输出为：

As of Date  F_Type      Value
31-Mar-17   ABC Corp    1.0
30-Apr-17   ABC Corp    1.0
31-May-17   ABC Corp    1.0
30-Jun-17   ABC Corp    1.1
31-Jul-17   ABC Corp    1.1
30-Aug-17   ABC Corp    1.1
30-Sep-17   ABC Corp    1.2

希望这就是您要找的。

从 Oracle 中的季度日期填充每月日期

Populate the monthly date from quarterly date in Oracle

oracle

datetime

date-arithmetic