Question

我想创建一个显示日期和计数的查询。我想显示一个范围内的所有日期，包括零计数的日期。我正在寻找一种不使用临时表的方法。

输出可能如下所示：

Time               Count
1/1/2017 01:00 AM  23
1/1/2017 02:00 AM  0
1/1/2017 03:00 AM  0
1/1/2017 04:00 AM  12

Answer 1

我能够提出一个添加零计数行的解决方案。结果集的示例如下。您将看到有一些重复的DayOfWeekByHour值。我需要弄清楚如何总结这些，但这基本上是我想要的。请参阅示例代码链接

DayOfWeekByHour，Count

100,0

101,0

102,0

100,23

201,100

example of code

SELECT 
    TO_NUMBER(MOD(V,7)+1 || LPAD(MOD(V,24),2,'0')) as DayOfWeekByHour, 0
FROM (
      SELECT 1 V FROM DUAL
     ) T
    MODEL DIMENSION BY (ROWNUM R)
        MEASURES (V)
        RULES ITERATE (168) (
        V[ITERATION_NUMBER] = CV(R) + 1
          )

UNION

SELECT    
    TO_NUMBER(
        TO_CHAR(
            TO_DATE(
                    EXTRACT(MONTH FROM ve.CREATED_TIMESTAMP) || '/' || 
                    EXTRACT(DAY FROM ve.CREATED_TIMESTAMP) || '/' || 
                    EXTRACT(YEAR FROM ve.CREATED_TIMESTAMP) ,'MM/DD/YYYY'),'D'),'99') * 100 + TO_NUMBER(TO_CHAR(TO_DATE(
                    EXTRACT(MONTH FROM ve.CREATED_TIMESTAMP) || '/' || 
                    EXTRACT(DAY FROM ve.CREATED_TIMESTAMP) || '/' || 
                    EXTRACT(YEAR FROM ve.CREATED_TIMESTAMP) || ' ' || 
                    EXTRACT(HOUR FROM ve.CREATED_TIMESTAMP) || ':' ||
                    EXTRACT(MINUTE FROM ve.CREATED_TIMESTAMP) 
                    ,'MM/DD/YYYY HH24:MI'
                    )
                ,'HH24'
                )
             , '99') AS DayOfWeekByHour,
     COUNT(*)
FROM 
    VIEWER.VIEWING_EVENT ve
WHERE 
    ve.CREATED_TIMESTAMP >= TO_TIMESTAMP('02-12-2016 00:00:00', 'dd-mm-yyyy hh24:mi:ss') AND 
    ve.CREATED_TIMESTAMP <= TO_TIMESTAMP('02-12-2017 00:00:00', 'dd-mm-yyyy hh24:mi:ss')
GROUP BY
   TO_NUMBER(
        TO_CHAR(
            TO_DATE(
                    EXTRACT(MONTH FROM ve.CREATED_TIMESTAMP) || '/' || 
                    EXTRACT(DAY FROM ve.CREATED_TIMESTAMP) || '/' || 
                    EXTRACT(YEAR FROM ve.CREATED_TIMESTAMP) ,'MM/DD/YYYY'),'D'),'99') * 100 + TO_NUMBER(TO_CHAR(TO_DATE(
                    EXTRACT(MONTH FROM ve.CREATED_TIMESTAMP) || '/' || 
                    EXTRACT(DAY FROM ve.CREATED_TIMESTAMP) || '/' || 
                    EXTRACT(YEAR FROM ve.CREATED_TIMESTAMP) || ' ' || 
                    EXTRACT(HOUR FROM ve.CREATED_TIMESTAMP) || ':' ||
                    EXTRACT(MINUTE FROM ve.CREATED_TIMESTAMP) 
                    ,'MM/DD/YYYY HH24:MI'
                    )
                ,'HH24'
                )
             , '99')
ORDER BY 
    DayOfWeekByHour
;

查询显示范围内的所有日期

1 个答案: