查询以生成日期时间列表

Question

我想构建一个查询，其中包含一些名为：

的变量

    EndDate --this is a date
    LookBackDays --this is an integer
    Interval -- this is an interval in SECONDS
    Name -- this is  a string
   open -this is a string and is hours and minutes  in 24HH
   close - this is string and is hours and minutes in 24HH

假设我将变量设置为：

EndDate to 7/4
LookBackDays  = 3
Inteval = 300 seconds
Name = "BOB"
open = "09:00"
close = "13:00"

然后我想生成一个从 Endate-LookbackDays 到 EndDate 的日期列表，看起来像

看起来像

  Date     Open      Close       Name
7/1/2015   09:00 AM    13:00 PM    Bob
7/2/2015   09:00 AM    13:00 PM    Bob
7/3/2015   09:00 AM    13:00 PM    Bob
7/4/2015   09:00 AM    13:00 PM    Bob
....
....

然后对于每个日期，我想使用 Interval 参数添加额外的行，其中对于每一行，我根据间隔将从打开时间到关闭时间的时间间隔分解到桶中，因此间隔为300 秒结果将是：

   date          oepn                close             name    IntervalEnd
 7/1/2015    7/1/2015 09:00 AM   7/1/2015 13:00 PM    Bob        09:05 AM
 7/1/2015   7/1/2015 09:00 AM   7/1/2015 13:00 PM    Bob        09:10 AM
 7/1/2015  7/1/2015 09:00 AM   7/1/2015 13:00 PM    Bob        09:15 AM
 7/1/2015  7/1/2015 09:00 AM    7/1/2015 13:00 PM    Bob        09:20 AM
 7/1/2015  7/1/2015 09:00 AM   7/1/2015 13:00 PM    Bob        09:25 AM
....
....
 7/1/2015   09:00 AM   7/1/2015 13:00 PM    Bob       7/1/2015 12:55 PM
 7/1/2015   09:00 AM   7/1/2015 13:00 PM    Bob       7/1/2015 01:00 PM
 **7/2/2015**  7/2/2015 09:00 AM   7/2/2015 13:00 PM    Bob        09:05 AM
 7/2/2015  7/2/2015 09:00 AM   7/2/2015 13:00 PM    Bob        09:10 AM
 7/2/2015  7/2/2015 09:00 AM   7/2/2015 13:00 PM    Bob        09:15 AM
 7/2/2015  7/2/2015 09:00 AM   7/2/2015 13:00 PM    Bob        09:20 AM
 7/2/2015  7/2/2015 09:00 AM   7/2/2015 13:00 PM    Bob        09:25 AM
....
....
 7/2/2015  7/2/2015 09:00 AM   7/2/2015 13:00 PM    Bob        12:55 PM
 7/2/2015  7/2/2015 09:00 AM   7/2/2015 13:00 PM    Bob        01:00 PM

...每天以此类推。所以基本上我每天都把它扩展到多个桶中

Answer 1

您可以交叉连接两个分层查询，如下所示：

with par as (
  select date '2015-07-04' enddate, 3 LookBackDays, 300 inteval, 'Bob' Name, 
         '09:00' open, '13:00' close from dual),
t1 as (
  select to_char(enddate-level+1, 'yyyy-mm-dd') dt, name, open, close from par
    connect by level <= LookBackDays + 1 ),
t2 as (
  select to_char(to_date(open, 'hh24:mi') + (level) * inteval / (24*60*60), 'hh24:mi') tm
    from par
    connect by to_date(open, 'hh24:mi') + level * inteval / (24*60*60) 
               <= to_date(close, 'hh24:mi') )
select to_date(dt, 'yyyy-mm-dd') dt, 
       to_date(dt||' '||open, 'yyyy-mm-dd hh24:mi') open, 
       to_date(dt||' '||close, 'yyyy-mm-dd hh24:mi') close, name, 
       to_date(dt||' '||tm, 'yyyy-mm-dd hh24:mi') IntervalEnd
  from t1 cross join t2 order by dt, tm

^{SQLFiddle demo}

查询以生成日期时间列表

Query to generate a list of date times

oracle

oracle10g

oracle11g