Friday, 15 April 2011

semantic web - SPARQL - learning by example -


In short, if someone gives me directions, a list of the databases included in "Oracle, Mysore, DB2, MSSQL etc. Receive., "How can I really establish that what fields and information do I need to create a query? I downloaded dBipedia and removed triples, e.g., 

  $ `grep 'oracle' * | Grep 'Database' article_categories_en.nt: & lt; Http: //dbpedia.org/resource/Oracle_Database> & Lt; Http: //purl.org/dc/terms/subject> & Lt; Http: //dbpedia.org/resource/Category: Relational_database_management_systems & gt; .   
 How do I create a SPARQL query from that initial question? Using that snippet, I know that Oracle is a company and one of its products has RDBMS with the same name. I tried searching on the lookup device and the web, but it did not get enough and some direction was needed.   
 
 
 In this special case, I am familiar with one of the things that you know by going to the DBPDA page That's what you want in your results. A good example is that on the page, you can start looking for properties that can help you find other related systems. A property listed on the page  
  dbpedia-owl: genre dbpedia: Relational_database_management_system   
 Then I will go and try to find other things, this same property and Price In this case, I can run the following query:  
  SELECT * WHERE {? Rdbms dbpedia-owl: genre dbpedia: Relational_database_management_system}   
  
 The results are very promising; There are 38 results first:  
  rdbms http://dbpedia.org/resource/MySQL_Cluster http://dbpedia.org/resource/MSQL http://dbpedia.org/resource/ OpenEdge_Advanced_Business_Language http: //dbpedia.org/resource/Adaptive_Server_Enterprise รข ?? |   
 In general, finding an example of what I'm looking for in Wikipedia is easier to find, then go to the respective DBPDA page and look at the properties, and then on that Prepare some searchable query based on   

 








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