获取每个日期间隔的管道总长度

时间:2011-04-12 07:57:08

标签: sql powerbuilder sqlanywhere

我有一个包含安装在某个位置的pipes的表格。 始终填写已安装的日期,删除的日期可以为NULL

Type   Installed     Removed     Length
PT2    01/01/2011    NULL        2000
PT2    01/01/2011    NULL        2000
PT1    01/01/2011    NULL        1200
PT1    01/01/2011    NULL        1200
PT1    15/02/2011    25/02/2011  1000
PT1    15/02/2011    25/02/2011  1000

现在我需要概述一个月内安装的每种类型的总长度,因此结果应该是01/02/201128/02/2011

 Type    From         To            Length
 PT2     01/02/2011   28/02/2011    4000
 PT1     01/02/2011   14/02/2011    2400 
 PT1     15/02/2011   24/02/2011    4400 Edit: (starts on 15 not 14)
 PT1     25/02/2011   28/02/2011    2400

编辑:澄清此预期结果。 最后,这将用于查看在请求的月份期间任何给定时刻的管道总长度。因此,如果您查看上表,则在2月2日安装了PT2个管道。它们是在1月安装的,但仍然存在,因此在整个月中总长度为4000 同样适用于PT1:从2月2日开始安装PT1管道,所以2400。但是在15号安装了额外的2根长度为1000的PT1管道,因此在15日至25日期间,PT1管道的总长度为4400
这25个管道在25日被移除,所以25个月到月底再次移除2400个 我希望现在更有意义了。

我正在努力解决如何在SQL中执行此操作,这是一个报告,通常在任何给定的月份都安装了数百个这样的管道。

它适用于Powerbuilder应用程序,因此如果您知道任何可能有助于分享的数据窗口技巧。

3 个答案:

答案 0 :(得分:1)

对此有太多的乐趣!我采取了一些自由,比如假设排序顺序,并将查询条件更改为日期范围而不是声明一个月。

首先,我将数据集从日期范围更改为更改日期和更改数量(安装日期为正值,删除日期为负值)。

SELECT type,
    installed as date_of_change,
    length change_of_length 
FROM pipes 
WHERE (installed BETWEEN :date_start AND
         :date_end) OR
     ((installed < :date_start) AND
         (isnull (removed, :date_end) >= :date_start)) 
UNION  ALL 
SELECT type,
    isnull (removed, dateadd (day, 1, :date_end)),
    (length * -1) 
FROM pipes 
WHERE (installed BETWEEN :date_start AND
         :date_end) OR
     ((installed < :date_start) AND
         (isnull (removed, :date_end) >= :date_start)) 
ORDER BY type,
    date_of_change 

而且,是的,在论证前面的那些冒号(我已经把你转到开始和结束日期......对我来说更容易,现在你可以做六个月的报告)意味着我正在利用DataWindow。 (我打赌有人可以用上面的概念改变创建一个纯粹的SQL方法,但我会按照我所知道的去做。)

将SQL加载到DataWindow(我使用自由格式),并可选择按类型和date_of_change(腰带和吊带)设置客户端排序。数据集包括null删除日期作为查询范围结束后一天的更改,因此创建一个过滤器以排除这些空值:

 date_of_change <=  date_end 

根据类型创建一个组,并将类型放入组头中。

在详细信息区域(所有后续控件都在其中),使用以下表达式创建名为date_from的计算:

if (date_of_change < date_start, date_start, date_of_change)

使用以下表达式创建名为date_to的计算:

if (type = type[1] and getrow() < rowcount() and date_of_change[1] <= date_end, 
RelativeDate(date_of_change[1], -1),  date_end )

使用以下表达式创建名为installed_length的计算:

cumulativesum ( change_of_length FOR GROUP 1)

选择详细信息区域中的所有控件,并为它们指定一个Visible表达式:

if (date_of_change =  date_of_change [1] and  type = type[1], 0, 1)
如果下一行具有相同的date_of_change和类型,

将使它们不可见;你只希望最后一行显示今天所有活动的总和。

将细节带拖动到零高度,并使细节带自动调整高度。

这将为您提供您所追求的版本。 FWIW,我试图按日期对报告进行排序(不清楚这是你想要的,还是首先在类型上排序),但它打破了CumulativeSum()功能。也许其他人可以搞清楚。

祝你好运,

特里。

P.S。如果SO让我把这个放进去,这就是我原型的导出。它可能对您有用,也可能没用。

release 11.5;
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table(column=(type=char(4) updatewhereclause=yes name=type dbname="pipes.type" )
 column=(type=datetime updatewhereclause=yes name=date_of_change dbname="pipes.date_of_change" )
 column=(type=long updatewhereclause=yes name=change_of_length dbname="pipes.change_of_length" )
 retrieve="SELECT type, installed as date_of_change, length change_of_length
from pipes
where (installed BETWEEN :date_start AND :date_end) OR 
    ((installed < :date_start) AND (isnull (removed, :date_end) >= :date_start))
union all
select type, isnull (removed, dateadd (day, 1, :date_end)), (length * -1)
from pipes
where (installed BETWEEN :date_start AND :date_end) OR 
    ((installed < :date_start) AND (isnull (removed, :date_end) >= :date_start))
order by date_of_change, type" filter=" date_of_change <=  date_end "arguments=(("date_start", date),("date_end", date))  sort="type A date_of_change A " )
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答案 1 :(得分:0)

您的示例结果似乎没有意义。这个

Type    From         To            Length
 PT2     01/02/2011   28/02/2011    4000
 PT1     01/02/2011   14/02/2011    2400 
 PT1     14/02/2011   24/02/2011    4400 
 PT1     25/02/2011   28/02/2011    2400

未显示1月或2月安装了多少PT1管道。

以下查询显示每月安装的管道总长度,每种类型一行。

select type, 
       extract(year from installed) || '-' || extract(month from installed) as year_month, 
       sum(length) 
from pipes
group by type, year_month
order by year_month, type

返回

PT1   2011-1   2400
PT2   2011-1   4000
PT1   2011-2   2000

稍后。 。

对于任何给定日期的管道总长度,我可能会使用类似的东西。

select p.type, 
       '2011-02-28' as effective_date, 
       (select sum(length)
         from pipes 
         where installed <= '2011-02-28'
           and type = p.type) as installed,
       (select sum(length)
        from pipes
        where removed <= '2011-02-28'
          and type = p.type) as removed
from pipes p
group by p.type, effective_date
order by type

该查询返回

type  effective_date   installed  removed
PT1   2011-02-28       4400       2000
PT2   2011-02-28       4000

答案 2 :(得分:0)

你的意思是在二月份(你的日期是DDMMYYY格式),PT1的长度应该是一个负数,所以如果你要在一年的第一季度运行报告,那么2月份的2000英尺被移除将从1月份安装的PT1的2400英尺中减去,PT1在本季度的净安装长度为400英尺?如果是这样,您可以将此作为两个内联或持久视图的交集,一个用于安装一个用于删除,类型和(提取)时间段是连接列,从每个类型的安装长度减去每个类型的每个类型的删除长度每期获得每个类型的每个期间的净安装长度。安装和删除之间的左连接。

如果您还需要跟踪贵公司未必安装的管道 - 例如有一个PT77被删除的记录,但没有安装PT77的记录,你可以将其作为两个内联或持久视图的UNION,一个用于安装,一个用于删除,删除被转换为负长度;然后你将UNION ALL查询本身变成一个内联视图,你可以按类型按周期分组并加总长度。