Question

我正在使用TopBraid Composer中的 SPARQL查询来获取每个月的数据质量规则数。

我有一个开始日期和结束日期，但我需要获取开始日期和结束日期之间的所有月份，以便我可以计算适用于该持续时间的数据质量规则。

我当前的查询和结果如下 - ：

SELECT *    
WHERE    
{    
   ?Rules CDE:Data_Quality_Rule_added_on ?Date1.    
   ?Rules CDE:Data_Quality_Removed_On ?Date2

   BIND(month(?Date1) AS ?Month1)    
   BIND(month(?Date2) AS ?Month2)    
   BIND(smf:duration("mon",?Date1,?Date2) AS ?dur)    
}    
LIMIT 5

| [Rules]                  | Date1      | Date2      | Month1 | Month2 | dur    
| CDE:Data_Quality_Rule_13 | 2016-01-28 | 2016-09-15 | 01     | 09     | 8   
| CDE:Data_Quality_Rule_16 | 2016-02-29 | 2016-08-08 | 02     | 08     | 5   
| CDE:Data_Quality_Rule_18 | 2016-05-15 | 2016-10-31 | 05     | 10     | 6   
| CDE:Data_Quality_Rule_4  | 2016-03-28 | 2016-07-02 | 03     | 07     | 3   
| CDE:Data_Quality_Rule_5  | 2016-02-02 | 2016-06-06 | 02     | 06     | 4

我可以获得开始月份，结束月份和持续时间。但是我希望在SPARQL中获得开始月份和结束月份之间的所有月份。最终结果是根据开始日期和结束日期获得数据质量规则数量的按月计算 - ：

| Months   | Number Of Data Quality Rules |
|  1       | 2                        
|  2       | 4                            
|  3       | 6                            
|  4       | 3                             
|  5       | 3                            
|  6       | 4                           
|  7       | 4                            
|  8       | 4                            
|  9       | 5                             
|  10      | 3                             
|  11      | 2                             
|  12      | 5

Answer 1

首先，使用的一些数据包含一些开始和结束日期的规则：

@prefix : <urn:ex:>
@prefix xsd: <http://www.w3.org/2001/XMLSchema#>

:rule1 :begin "2011-01-10T14:45:13.815-05:00"^^xsd:dateTime ;
       :end   "2011-06-10T14:45:13.815-05:00"^^xsd:dateTime .

:rule2 :begin "2011-04-10T14:45:13.815-05:00"^^xsd:dateTime ;
       :end   "2011-10-10T14:45:13.815-05:00"^^xsd:dateTime .

:rule3 :begin "2011-06-10T14:45:13.815-05:00"^^xsd:dateTime ;
       :end   "2011-11-10T14:45:13.815-05:00"^^xsd:dateTime .

然后，您可以编写一个查询，以获取每个规则处于活动状态的月份。如果您按月分组并计算规则数，则会获得每月活动的规则数：

prefix : <urn:ex:>
prefix xsd: <http://www.w3.org/2001/XMLSchema#>

select ?rule ?month {
  #-- Specify the possible values for ?month
  #-- in advance.  These are just the numbers
  #-- one through twelve.
  values ?month { 1 2 3 4 5 6 7 8 9 10 11 12 }

  #-- Get the begin and end dates of that
  #-- you're interested in.  The way you
  #-- do this depends on the structure of
  #-- your data, of course.
  ?rule :begin ?begin ; :end ?end .

  #-- Then take only the values of ?month
  #-- that are between the beginning month
  #-- and the ending month.
  filter ( month(?begin) <= ?month && ?month <= month(?end) )
}

------------------
| rule   | month |
==================
| :rule1 | 1     |
| :rule1 | 2     |
| :rule1 | 3     |
| :rule1 | 4     |
| :rule1 | 5     |
| :rule1 | 6     |
| :rule2 | 4     |
| :rule2 | 5     |
| :rule2 | 6     |
| :rule2 | 7     |
| :rule2 | 8     |
| :rule2 | 9     |
| :rule2 | 10    |
| :rule3 | 6     |
| :rule3 | 7     |
| :rule3 | 8     |
| :rule3 | 9     |
| :rule3 | 10    |
| :rule3 | 11    |
------------------

现在，您可以按月对这些结果进行分组，然后计算每个月的规则数量：

prefix : <urn:ex:>
prefix xsd: <http://www.w3.org/2001/XMLSchema#>

select ?month (count(distinct ?rule) as ?numRules) where {
  values ?month { 1 2 3 4 5 6 7 8 9 10 11 12 }

  ?rule :begin ?begin ; :end ?end .

  filter ( month(?begin) <= ?month && ?month <= month(?end) )
}
group by ?month

--------------------
| month | numRules |
====================
| 1     | 1        |
| 2     | 1        |
| 3     | 1        |
| 4     | 2        |
| 5     | 2        |
| 6     | 3        |
| 7     | 2        |
| 8     | 2        |
| 9     | 2        |
| 10    | 2        |
| 11    | 1        |
--------------------

结果中没有包含第12个月，因为当时没有活动规则。如果您希望列出所有月份，则可以将规则匹配部分设为可选：

prefix : <urn:ex:>
prefix xsd: <http://www.w3.org/2001/XMLSchema#>

select ?month (count(distinct ?rule) as ?numRules) {
  values ?month { 1 2 3 4 5 6 7 8 9 10 11 12 }

  optional {
    ?rule :begin ?begin ; :end ?end .
    filter ( month(?begin) <= ?month && ?month <= month(?end) )
  }
}
group by ?month

--------------------
| month | numRules |
====================
| 1     | 1        |
| 2     | 1        |
| 3     | 1        |
| 4     | 2        |
| 5     | 2        |
| 6     | 3        |
| 7     | 2        |
| 8     | 2        |
| 9     | 2        |
| 10    | 2        |
| 11    | 1        |
| 12    | 0        |
--------------------

sparql获取SPARQL两个日期之间的所有月份

1 个答案: