Feedback

Creating synergies and interactions among the analysts and the “producers” of data. See details.

Reuse these data in your code

Query, endpoint and code for reusing the same data
https://query.wikidata.org/sparql
PREFIX bd: <http://www.bigdata.com/rdf#> 
PREFIX p: <http://www.wikidata.org/prop/> 
PREFIX pq: <http://www.wikidata.org/prop/qualifier/> 
PREFIX ps: <http://www.wikidata.org/prop/statement/> 
PREFIX wd: <http://www.wikidata.org/entity/> 
PREFIX wdt: <http://www.wikidata.org/prop/direct/> 
PREFIX wikibase: <http://wikiba.se/ontology#> 

#defaultView:BarChart
# male/female population _must_ not be added unqualified as total population (!)
# this is an error and should be fixed at the item using P1540 and P1539 instead
# (wrong query result may be a manifestation of such)
SELECT ?year (AVG(?pop) AS ?population) ?countryLabel
       (COUNT(*) AS ?number_of_chosen_sources) (SAMPLE(?method) AS ?a_source_of_those_chosen)
WHERE
{
  ?country wdt:P31 wd:Q6256;
           p:P1082 ?popStatement .
  ?popStatement ps:P1082 ?pop;
                pq:P585 ?date .
  BIND(STR(YEAR(?date)) AS ?year)
  
  # IF multiple ?pop values per country per year exist, we prioritize by source
  #       census 1st, others 2nd, estimation(s) 3rd, unknown sources (none supplies P459) last
  # note wikibaserank won't help here each year may have multiple statements for ?pop value
  #       rankprefered is used for the best value (or values) of the latest or current year
  #       ranknormal may be justified for all of multiple ?pop values for a given year
  OPTIONAL { ?popStatement pq:P459 ?method. }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?d; pq:P459 ?estimate ].
             FILTER(STR(YEAR(?d)) = ?year). FILTER(?estimate = wd:Q791801). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?e; pq:P459 ?census ].
             FILTER(STR(YEAR(?e)) = ?year). FILTER(?census = wd:Q39825). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?f; pq:P459 ?other ].
             FILTER(STR(YEAR(?f)) = ?year). FILTER(?other != wd:Q39825 && ?other != wd:Q791801). }
  BIND(COALESCE( 
    IF(BOUND(?census), ?census, 1/0),
    IF(BOUND(?other), ?other, 1/0),
    IF(BOUND(?estimate), ?estimate, 1/0) ) AS ?pref_method).
  FILTER(IF(BOUND(?pref_method),?method = ?pref_method,true))
  # .. still need to group if multiple values per country per year exist and
  # - none is qualified with P459
  # - multiple ?estimate or multiple ?census (>1 value from same source)
  # - ?other yields more than one source (>1 values are better than optionally
  #                         supplied estimate, but no census source available)

  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }               
}
GROUP BY ?year ?countryLabel
ORDER BY ?year ?countryLabel
Howto write a query SPARQL? (in French)
{{#sparql:PREFIX bd: <http://www.bigdata.com/rdf#> 
PREFIX p: <http://www.wikidata.org/prop/> 
PREFIX pq: <http://www.wikidata.org/prop/qualifier/> 
PREFIX ps: <http://www.wikidata.org/prop/statement/> 
PREFIX wd: <http://www.wikidata.org/entity/> 
PREFIX wdt: <http://www.wikidata.org/prop/direct/> 
PREFIX wikibase: <http://wikiba.se/ontology#> 

#defaultView:BarChart
# male/female population _must_ not be added unqualified as total population (!)
# this is an error and should be fixed at the item using P1540 and P1539 instead
# (wrong query result may be a manifestation of such)
SELECT ?year (AVG(?pop) AS ?population) ?countryLabel
       (COUNT(*) AS ?number_of_chosen_sources) (SAMPLE(?method) AS ?a_source_of_those_chosen)
WHERE
{
  ?country wdt:P31 wd:Q6256;
           p:P1082 ?popStatement .
  ?popStatement ps:P1082 ?pop;
                pq:P585 ?date .
  BIND(STR(YEAR(?date)) AS ?year)
  
  # IF multiple ?pop values per country per year exist, we prioritize by source
  #       census 1st, others 2nd, estimation(s) 3rd, unknown sources (none supplies P459) last
  # note wikibaserank won't help here each year may have multiple statements for ?pop value
  #       rankprefered is used for the best value (or values) of the latest or current year
  #       ranknormal may be justified for all of multiple ?pop values for a given year
  OPTIONAL { ?popStatement pq:P459 ?method. }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?d; pq:P459 ?estimate ].
             FILTER(STR(YEAR(?d)) = ?year). FILTER(?estimate = wd:Q791801). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?e; pq:P459 ?census ].
             FILTER(STR(YEAR(?e)) = ?year). FILTER(?census = wd:Q39825). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?f; pq:P459 ?other ].
             FILTER(STR(YEAR(?f)) = ?year). FILTER(?other != wd:Q39825 && ?other != wd:Q791801). }
  BIND(COALESCE( 
    IF(BOUND(?census), ?census, 1/0),
    IF(BOUND(?other), ?other, 1/0),
    IF(BOUND(?estimate), ?estimate, 1/0) ) AS ?pref_method).
  FILTER(IF(BOUND(?pref_method),?method = ?pref_method,true))
  # .. still need to group if multiple values per country per year exist and
  # - none is qualified with P459
  # - multiple ?estimate or multiple ?census (>1 value from same source)
  # - ?other yields more than one source (>1 values are better than optionally
  #                         supplied estimate, but no census source available)

  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }               
}
GROUP BY ?year ?countryLabel
ORDER BY ?year ?countryLabel
| endpoint = https://query.wikidata.org/sparql
| chart=bordercloud.visualization.DataTable
| options=
| log=2
}}
Howto install LinkedWiki in my wiki? Howto insert this graph in my wiki?
Test this script in a new tab.
<html>
    <head>
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"  async></script>
    </head>
    <body onload="testQuery();">
        <script>
function testQuery(){
    var endpoint = "https://query.wikidata.org/sparql";
    var query = "PREFIX bd: <http://www.bigdata.com/rdf#> \n\
PREFIX p: <http://www.wikidata.org/prop/> \n\
PREFIX pq: <http://www.wikidata.org/prop/qualifier/> \n\
PREFIX ps: <http://www.wikidata.org/prop/statement/> \n\
PREFIX wd: <http://www.wikidata.org/entity/> \n\
PREFIX wdt: <http://www.wikidata.org/prop/direct/> \n\
PREFIX wikibase: <http://wikiba.se/ontology#> \n\
\n\
#defaultView:BarChart\n\
# male/female population _must_ not be added unqualified as total population (!)\n\
# this is an error and should be fixed at the item using P1540 and P1539 instead\n\
# (wrong query result may be a manifestation of such)\n\
SELECT ?year (AVG(?pop) AS ?population) ?countryLabel\n\
       (COUNT(*) AS ?number_of_chosen_sources) (SAMPLE(?method) AS ?a_source_of_those_chosen)\n\
WHERE\n\
{\n\
  ?country wdt:P31 wd:Q6256;\n\
           p:P1082 ?popStatement .\n\
  ?popStatement ps:P1082 ?pop;\n\
                pq:P585 ?date .\n\
  BIND(STR(YEAR(?date)) AS ?year)\n\
  \n\
  # IF multiple ?pop values per country per year exist, we prioritize by source\n\
  #       census 1st, others 2nd, estimation(s) 3rd, unknown sources (none supplies P459) last\n\
  # note wikibaserank won\'t help here each year may have multiple statements for ?pop value\n\
  #       rankprefered is used for the best value (or values) of the latest or current year\n\
  #       ranknormal may be justified for all of multiple ?pop values for a given year\n\
  OPTIONAL { ?popStatement pq:P459 ?method. }\n\
  OPTIONAL { ?country p:P1082 [ pq:P585 ?d; pq:P459 ?estimate ].\n\
             FILTER(STR(YEAR(?d)) = ?year). FILTER(?estimate = wd:Q791801). }\n\
  OPTIONAL { ?country p:P1082 [ pq:P585 ?e; pq:P459 ?census ].\n\
             FILTER(STR(YEAR(?e)) = ?year). FILTER(?census = wd:Q39825). }\n\
  OPTIONAL { ?country p:P1082 [ pq:P585 ?f; pq:P459 ?other ].\n\
             FILTER(STR(YEAR(?f)) = ?year). FILTER(?other != wd:Q39825 && ?other != wd:Q791801). }\n\
  BIND(COALESCE( \n\
    IF(BOUND(?census), ?census, 1/0),\n\
    IF(BOUND(?other), ?other, 1/0),\n\
    IF(BOUND(?estimate), ?estimate, 1/0) ) AS ?pref_method).\n\
  FILTER(IF(BOUND(?pref_method),?method = ?pref_method,true))\n\
  # .. still need to group if multiple values per country per year exist and\n\
  # - none is qualified with P459\n\
  # - multiple ?estimate or multiple ?census (>1 value from same source)\n\
  # - ?other yields more than one source (>1 values are better than optionally\n\
  #                         supplied estimate, but no census source available)\n\
\n\
  SERVICE wikibase:label { bd:serviceParam wikibase:language \"[AUTO_LANGUAGE],en\" }               \n\
}\n\
GROUP BY ?year ?countryLabel\n\
ORDER BY ?year ?countryLabel"

   // $('#bodyContentResearch').append(queryDataset);
    $.ajax({
                url: endpoint,
                dataType: 'json',
                data: {
                    queryLn: 'SPARQL',
                    query: query ,
                    limit: 'none',
                    infer: 'true',
                    Accept: 'application/sparql-results+json'
                },
                success: displayResult,
                error: displayError
        });
}

function displayError(xhr, textStatus, errorThrown) {
    console.log(textStatus);
    console.log(errorThrown);
}

function displayResult(data) {
    $.each(data.results.bindings, function(index, bs) {
        console.log(bs);
        $("body").append(JSON.stringify(bs) + "<hr/>");
    });
}

        </script>
    </body>
</html>
Test this script in a new tab (Careful, several charts need a API key).
Howto insert this graph in my html page?
<html>
    <head>
     <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.9.0/css/all.min.css">

     <script
            src="https://code.jquery.com/jquery-3.4.1.min.js"
            integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo="
            crossorigin="anonymous"> </script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"> </script>
     <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"> </script>

     <script type="text/javascript" src="https://bordercloud.github.io/sgvizler2/sgvizler2/sgvizler2.js" defer> </script>
     <script type="text/javascript" src="https://io.datascience-paris-saclay.fr/js/initExampleHTML.js"  defer > </script>
    </head>
<body style="margin:0;">
<div id="sgvzl_example_query"
   data-sgvizler-endpoint="https://query.wikidata.org/sparql"
   data-sgvizler-query="PREFIX bd: &lt;http://www.bigdata.com/rdf#&gt; 
PREFIX p: &lt;http://www.wikidata.org/prop/&gt; 
PREFIX pq: &lt;http://www.wikidata.org/prop/qualifier/&gt; 
PREFIX ps: &lt;http://www.wikidata.org/prop/statement/&gt; 
PREFIX wd: &lt;http://www.wikidata.org/entity/&gt; 
PREFIX wdt: &lt;http://www.wikidata.org/prop/direct/&gt; 
PREFIX wikibase: &lt;http://wikiba.se/ontology#&gt; 

#defaultView:BarChart
# male/female population _must_ not be added unqualified as total population (!)
# this is an error and should be fixed at the item using P1540 and P1539 instead
# (wrong query result may be a manifestation of such)
SELECT ?year (AVG(?pop) AS ?population) ?countryLabel
       (COUNT(*) AS ?number_of_chosen_sources) (SAMPLE(?method) AS ?a_source_of_those_chosen)
WHERE
{
  ?country wdt:P31 wd:Q6256;
           p:P1082 ?popStatement .
  ?popStatement ps:P1082 ?pop;
                pq:P585 ?date .
  BIND(STR(YEAR(?date)) AS ?year)
  
  # IF multiple ?pop values per country per year exist, we prioritize by source
  #       census 1st, others 2nd, estimation(s) 3rd, unknown sources (none supplies P459) last
  # note wikibaserank won&#039;t help here each year may have multiple statements for ?pop value
  #       rankprefered is used for the best value (or values) of the latest or current year
  #       ranknormal may be justified for all of multiple ?pop values for a given year
  OPTIONAL { ?popStatement pq:P459 ?method. }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?d; pq:P459 ?estimate ].
             FILTER(STR(YEAR(?d)) = ?year). FILTER(?estimate = wd:Q791801). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?e; pq:P459 ?census ].
             FILTER(STR(YEAR(?e)) = ?year). FILTER(?census = wd:Q39825). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?f; pq:P459 ?other ].
             FILTER(STR(YEAR(?f)) = ?year). FILTER(?other != wd:Q39825 &amp;&amp; ?other != wd:Q791801). }
  BIND(COALESCE( 
    IF(BOUND(?census), ?census, 1/0),
    IF(BOUND(?other), ?other, 1/0),
    IF(BOUND(?estimate), ?estimate, 1/0) ) AS ?pref_method).
  FILTER(IF(BOUND(?pref_method),?method = ?pref_method,true))
  # .. still need to group if multiple values per country per year exist and
  # - none is qualified with P459
  # - multiple ?estimate or multiple ?census (&gt;1 value from same source)
  # - ?other yields more than one source (&gt;1 values are better than optionally
  #                         supplied estimate, but no census source available)

  SERVICE wikibase:label { bd:serviceParam wikibase:language &quot;[AUTO_LANGUAGE],en&quot; }               
}
GROUP BY ?year ?countryLabel
ORDER BY ?year ?countryLabel"
    data-sgvizler-chart='bordercloud.visualization.DataTable'
    data-sgvizler-chart-options=''
    data-sgvizler-endpoint_output_format='json'
    data-sgvizler-log='2'
    style='width:100%; height:auto;'  />

<script>
/*$(function() {
   sgvizler2.containerDrawAll({
       // Google Api key
       googleApiKey : "GOOGLE_MAP_API_KEY",
       // OpenStreetMap Access Token
       //  https://www.mapbox.com/api-documentation/#access-tokens
       osmAccessToken : "OSM_MAP_API_KEY"
     });
});*/
</script>

</body>
</html>
from SPARQLWrapper import SPARQLWrapper, JSON

sparql = SPARQLWrapper("https://query.wikidata.org/sparql")
sparql.setQuery("""
    PREFIX bd: <http://www.bigdata.com/rdf#> 
PREFIX p: <http://www.wikidata.org/prop/> 
PREFIX pq: <http://www.wikidata.org/prop/qualifier/> 
PREFIX ps: <http://www.wikidata.org/prop/statement/> 
PREFIX wd: <http://www.wikidata.org/entity/> 
PREFIX wdt: <http://www.wikidata.org/prop/direct/> 
PREFIX wikibase: <http://wikiba.se/ontology#> 

#defaultView:BarChart
# male/female population _must_ not be added unqualified as total population (!)
# this is an error and should be fixed at the item using P1540 and P1539 instead
# (wrong query result may be a manifestation of such)
SELECT ?year (AVG(?pop) AS ?population) ?countryLabel
       (COUNT(*) AS ?number_of_chosen_sources) (SAMPLE(?method) AS ?a_source_of_those_chosen)
WHERE
{
  ?country wdt:P31 wd:Q6256;
           p:P1082 ?popStatement .
  ?popStatement ps:P1082 ?pop;
                pq:P585 ?date .
  BIND(STR(YEAR(?date)) AS ?year)
  
  # IF multiple ?pop values per country per year exist, we prioritize by source
  #       census 1st, others 2nd, estimation(s) 3rd, unknown sources (none supplies P459) last
  # note wikibaserank won't help here each year may have multiple statements for ?pop value
  #       rankprefered is used for the best value (or values) of the latest or current year
  #       ranknormal may be justified for all of multiple ?pop values for a given year
  OPTIONAL { ?popStatement pq:P459 ?method. }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?d; pq:P459 ?estimate ].
             FILTER(STR(YEAR(?d)) = ?year). FILTER(?estimate = wd:Q791801). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?e; pq:P459 ?census ].
             FILTER(STR(YEAR(?e)) = ?year). FILTER(?census = wd:Q39825). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?f; pq:P459 ?other ].
             FILTER(STR(YEAR(?f)) = ?year). FILTER(?other != wd:Q39825 && ?other != wd:Q791801). }
  BIND(COALESCE( 
    IF(BOUND(?census), ?census, 1/0),
    IF(BOUND(?other), ?other, 1/0),
    IF(BOUND(?estimate), ?estimate, 1/0) ) AS ?pref_method).
  FILTER(IF(BOUND(?pref_method),?method = ?pref_method,true))
  # .. still need to group if multiple values per country per year exist and
  # - none is qualified with P459
  # - multiple ?estimate or multiple ?census (>1 value from same source)
  # - ?other yields more than one source (>1 values are better than optionally
  #                         supplied estimate, but no census source available)

  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }               
}
GROUP BY ?year ?countryLabel
ORDER BY ?year ?countryLabel""")
sparql.setReturnFormat(JSON)
results = sparql.query().convert()

for result in results["results"]["bindings"]:
    print(result)
    #print(result["label"]["value"])
Howto use SPARQL with Python ?
library(SPARQL) # SPARQL querying package
library(ggplot2)

# Step 1 - Set up preliminaries and define query
# Define the data.gov endpoint
    endpoint <- "https://query.wikidata.org/sparql"
# create query statement
    query <- "PREFIX bd: <http://www.bigdata.com/rdf#> 
PREFIX p: <http://www.wikidata.org/prop/> 
PREFIX pq: <http://www.wikidata.org/prop/qualifier/> 
PREFIX ps: <http://www.wikidata.org/prop/statement/> 
PREFIX wd: <http://www.wikidata.org/entity/> 
PREFIX wdt: <http://www.wikidata.org/prop/direct/> 
PREFIX wikibase: <http://wikiba.se/ontology#> 

#defaultView:BarChart
# male/female population _must_ not be added unqualified as total population (!)
# this is an error and should be fixed at the item using P1540 and P1539 instead
# (wrong query result may be a manifestation of such)
SELECT ?year (AVG(?pop) AS ?population) ?countryLabel
       (COUNT(*) AS ?number_of_chosen_sources) (SAMPLE(?method) AS ?a_source_of_those_chosen)
WHERE
{
  ?country wdt:P31 wd:Q6256;
           p:P1082 ?popStatement .
  ?popStatement ps:P1082 ?pop;
                pq:P585 ?date .
  BIND(STR(YEAR(?date)) AS ?year)
  
  # IF multiple ?pop values per country per year exist, we prioritize by source
  #       census 1st, others 2nd, estimation(s) 3rd, unknown sources (none supplies P459) last
  # note wikibaserank won't help here each year may have multiple statements for ?pop value
  #       rankprefered is used for the best value (or values) of the latest or current year
  #       ranknormal may be justified for all of multiple ?pop values for a given year
  OPTIONAL { ?popStatement pq:P459 ?method. }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?d; pq:P459 ?estimate ].
             FILTER(STR(YEAR(?d)) = ?year). FILTER(?estimate = wd:Q791801). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?e; pq:P459 ?census ].
             FILTER(STR(YEAR(?e)) = ?year). FILTER(?census = wd:Q39825). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?f; pq:P459 ?other ].
             FILTER(STR(YEAR(?f)) = ?year). FILTER(?other != wd:Q39825 && ?other != wd:Q791801). }
  BIND(COALESCE( 
    IF(BOUND(?census), ?census, 1/0),
    IF(BOUND(?other), ?other, 1/0),
    IF(BOUND(?estimate), ?estimate, 1/0) ) AS ?pref_method).
  FILTER(IF(BOUND(?pref_method),?method = ?pref_method,true))
  # .. still need to group if multiple values per country per year exist and
  # - none is qualified with P459
  # - multiple ?estimate or multiple ?census (>1 value from same source)
  # - ?other yields more than one source (>1 values are better than optionally
  #                         supplied estimate, but no census source available)

  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }               
}
GROUP BY ?year ?countryLabel
ORDER BY ?year ?countryLabel"
# Step 2 - Use SPARQL package to submit query and save results to a data frame
qd <- SPARQL(endpoint,query)
df <- qd$results
SPARQL with R in less than 5 minutes
#!/usr/bin/env ruby
#
# Install sparql for Ruby
#   gem update --system
#   gem install sparql
#
require 'sparql/client'

endpoint = "https://query.wikidata.org/sparql"
sparql = <<-EOT
PREFIX bd: <http://www.bigdata.com/rdf#> 
PREFIX p: <http://www.wikidata.org/prop/> 
PREFIX pq: <http://www.wikidata.org/prop/qualifier/> 
PREFIX ps: <http://www.wikidata.org/prop/statement/> 
PREFIX wd: <http://www.wikidata.org/entity/> 
PREFIX wdt: <http://www.wikidata.org/prop/direct/> 
PREFIX wikibase: <http://wikiba.se/ontology#> 

#defaultView:BarChart
# male/female population _must_ not be added unqualified as total population (!)
# this is an error and should be fixed at the item using P1540 and P1539 instead
# (wrong query result may be a manifestation of such)
SELECT ?year (AVG(?pop) AS ?population) ?countryLabel
       (COUNT(*) AS ?number_of_chosen_sources) (SAMPLE(?method) AS ?a_source_of_those_chosen)
WHERE
{
  ?country wdt:P31 wd:Q6256;
           p:P1082 ?popStatement .
  ?popStatement ps:P1082 ?pop;
                pq:P585 ?date .
  BIND(STR(YEAR(?date)) AS ?year)
  
  # IF multiple ?pop values per country per year exist, we prioritize by source
  #       census 1st, others 2nd, estimation(s) 3rd, unknown sources (none supplies P459) last
  # note wikibaserank won't help here each year may have multiple statements for ?pop value
  #       rankprefered is used for the best value (or values) of the latest or current year
  #       ranknormal may be justified for all of multiple ?pop values for a given year
  OPTIONAL { ?popStatement pq:P459 ?method. }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?d; pq:P459 ?estimate ].
             FILTER(STR(YEAR(?d)) = ?year). FILTER(?estimate = wd:Q791801). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?e; pq:P459 ?census ].
             FILTER(STR(YEAR(?e)) = ?year). FILTER(?census = wd:Q39825). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?f; pq:P459 ?other ].
             FILTER(STR(YEAR(?f)) = ?year). FILTER(?other != wd:Q39825 && ?other != wd:Q791801). }
  BIND(COALESCE( 
    IF(BOUND(?census), ?census, 1/0),
    IF(BOUND(?other), ?other, 1/0),
    IF(BOUND(?estimate), ?estimate, 1/0) ) AS ?pref_method).
  FILTER(IF(BOUND(?pref_method),?method = ?pref_method,true))
  # .. still need to group if multiple values per country per year exist and
  # - none is qualified with P459
  # - multiple ?estimate or multiple ?census (>1 value from same source)
  # - ?other yields more than one source (>1 values are better than optionally
  #                         supplied estimate, but no census source available)

  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }               
}
GROUP BY ?year ?countryLabel
ORDER BY ?year ?countryLabel
EOT

#For Wikidata, the method get is required
#For other SPARQL endpoints, the method post is prefered
client = SPARQL::Client.new(endpoint, :method => :get)
rows = client.query(sparql)

puts "Number of rows: #{rows.size}"
for row in rows
  for key,val in row do
    # print "#{key.to_s.ljust(10)}: #{val}\t"
    print "#{key}: #{val}\t"
  end
  print "\n"
end
Doc Ruby for SPARQL 1.1
endpoint = 'https://query.wikidata.org/sparql';

query = ['PREFIX bd: <http://www.bigdata.com/rdf#>  '...
'PREFIX p: <http://www.wikidata.org/prop/>  '...
'PREFIX pq: <http://www.wikidata.org/prop/qualifier/>  '...
'PREFIX ps: <http://www.wikidata.org/prop/statement/>  '...
'PREFIX wd: <http://www.wikidata.org/entity/>  '...
'PREFIX wdt: <http://www.wikidata.org/prop/direct/>  '...
'PREFIX wikibase: <http://wikiba.se/ontology#>  '...
' '...
'#defaultView:BarChart '...
'# male/female population _must_ not be added unqualified as total population (!) '...
'# this is an error and should be fixed at the item using P1540 and P1539 instead '...
'# (wrong query result may be a manifestation of such) '...
'SELECT ?year (AVG(?pop) AS ?population) ?countryLabel '...
'       (COUNT(*) AS ?number_of_chosen_sources) (SAMPLE(?method) AS ?a_source_of_those_chosen) '...
'WHERE '...
'{ '...
'  ?country wdt:P31 wd:Q6256; '...
'           p:P1082 ?popStatement . '...
'  ?popStatement ps:P1082 ?pop; '...
'                pq:P585 ?date . '...
'  BIND(STR(YEAR(?date)) AS ?year) '...
'   '...
'  # IF multiple ?pop values per country per year exist, we prioritize by source '...
'  #       census 1st, others 2nd, estimation(s) 3rd, unknown sources (none supplies P459) last '...
'  # note wikibaserank won't help here each year may have multiple statements for ?pop value '...
'  #       rankprefered is used for the best value (or values) of the latest or current year '...
'  #       ranknormal may be justified for all of multiple ?pop values for a given year '...
'  OPTIONAL { ?popStatement pq:P459 ?method. } '...
'  OPTIONAL { ?country p:P1082 [ pq:P585 ?d; pq:P459 ?estimate ]. '...
'             FILTER(STR(YEAR(?d)) = ?year). FILTER(?estimate = wd:Q791801). } '...
'  OPTIONAL { ?country p:P1082 [ pq:P585 ?e; pq:P459 ?census ]. '...
'             FILTER(STR(YEAR(?e)) = ?year). FILTER(?census = wd:Q39825). } '...
'  OPTIONAL { ?country p:P1082 [ pq:P585 ?f; pq:P459 ?other ]. '...
'             FILTER(STR(YEAR(?f)) = ?year). FILTER(?other != wd:Q39825 && ?other != wd:Q791801). } '...
'  BIND(COALESCE(  '...
'    IF(BOUND(?census), ?census, 1/0), '...
'    IF(BOUND(?other), ?other, 1/0), '...
'    IF(BOUND(?estimate), ?estimate, 1/0) ) AS ?pref_method). '...
'  FILTER(IF(BOUND(?pref_method),?method = ?pref_method,true)) '...
'  # .. still need to group if multiple values per country per year exist and '...
'  # - none is qualified with P459 '...
'  # - multiple ?estimate or multiple ?census (>1 value from same source) '...
'  # - ?other yields more than one source (>1 values are better than optionally '...
'  #                         supplied estimate, but no census source available) '...
' '...
'  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }                '...
'} '...
'GROUP BY ?year ?countryLabel '...
'ORDER BY ?year ?countryLabel '];

url_head = strcat(endpoint,'?query=');
url_query = urlencode(query);
format = 'text/tab-separated-values';
url_tail = strcat('&format=', format);

url = strcat(url_head, url_query, url_tail);

% get the data from the endpoint
query_results = urlread(url);

% write the data to a file so that tdfread can parse it
fid = fopen('query_results.txt','w');
if fid>=0
    fprintf(fid, '%s\n', query_results)
    fclose(fid)
end

% this reads the tsv file into a struct
sparql_data = tdfread('query_results.txt')
Project Github MatlabSPARQL
<?php
require __DIR__ . '/../vendor/autoload.php';
use BorderCloud\SPARQL\SparqlClient;

$endpoint ="https://query.wikidata.org/sparql";
$sp_readonly = new SparqlClient();
$sp_readonly->setEndpointRead($endpoint);
$q = <<<EOD
PREFIX bd: <http://www.bigdata.com/rdf#> 
PREFIX p: <http://www.wikidata.org/prop/> 
PREFIX pq: <http://www.wikidata.org/prop/qualifier/> 
PREFIX ps: <http://www.wikidata.org/prop/statement/> 
PREFIX wd: <http://www.wikidata.org/entity/> 
PREFIX wdt: <http://www.wikidata.org/prop/direct/> 
PREFIX wikibase: <http://wikiba.se/ontology#> 

#defaultView:BarChart
# male/female population _must_ not be added unqualified as total population (!)
# this is an error and should be fixed at the item using P1540 and P1539 instead
# (wrong query result may be a manifestation of such)
SELECT ?year (AVG(?pop) AS ?population) ?countryLabel
       (COUNT(*) AS ?number_of_chosen_sources) (SAMPLE(?method) AS ?a_source_of_those_chosen)
WHERE
{
  ?country wdt:P31 wd:Q6256;
           p:P1082 ?popStatement .
  ?popStatement ps:P1082 ?pop;
                pq:P585 ?date .
  BIND(STR(YEAR(?date)) AS ?year)
  
  # IF multiple ?pop values per country per year exist, we prioritize by source
  #       census 1st, others 2nd, estimation(s) 3rd, unknown sources (none supplies P459) last
  # note wikibaserank won't help here each year may have multiple statements for ?pop value
  #       rankprefered is used for the best value (or values) of the latest or current year
  #       ranknormal may be justified for all of multiple ?pop values for a given year
  OPTIONAL { ?popStatement pq:P459 ?method. }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?d; pq:P459 ?estimate ].
             FILTER(STR(YEAR(?d)) = ?year). FILTER(?estimate = wd:Q791801). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?e; pq:P459 ?census ].
             FILTER(STR(YEAR(?e)) = ?year). FILTER(?census = wd:Q39825). }
  OPTIONAL { ?country p:P1082 [ pq:P585 ?f; pq:P459 ?other ].
             FILTER(STR(YEAR(?f)) = ?year). FILTER(?other != wd:Q39825 && ?other != wd:Q791801). }
  BIND(COALESCE( 
    IF(BOUND(?census), ?census, 1/0),
    IF(BOUND(?other), ?other, 1/0),
    IF(BOUND(?estimate), ?estimate, 1/0) ) AS ?pref_method).
  FILTER(IF(BOUND(?pref_method),?method = ?pref_method,true))
  # .. still need to group if multiple values per country per year exist and
  # - none is qualified with P459
  # - multiple ?estimate or multiple ?census (>1 value from same source)
  # - ?other yields more than one source (>1 values are better than optionally
  #                         supplied estimate, but no census source available)

  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }               
}
GROUP BY ?year ?countryLabel
ORDER BY ?year ?countryLabelEOD;
$rows = $sp_readonly->query($q, 'rows');
$err = $sp_readonly->getErrors();
if ($err) {
      print_r($err);
      throw new Exception(print_r($err,true));
}

foreach($rows["result"]["variables"] as $variable){
        printf("%-20.20s",$variable);
        echo '|';
 }
 echo "\n";

foreach ($rows["result"]["rows"] as $row){
        foreach($rows["result"]["variables"] as $variable){
                printf("%-20.20s",$row[$variable]);
        echo '|';
        }
        echo "\n";
 }
 ?>
Project Github BorderCloud/SPARQL
import com.bordercloud.sparql.Endpoint;
import java.util.ArrayList;
import java.util.HashMap;

public class Main {

    public static void main(String[] args) {
        try {
            Endpoint sp = new Endpoint("https://query.wikidata.org/sparql";, false);

            String querySelect = 'PREFIX bd: <http://www.bigdata.com/rdf#>  \n'
                    + 'PREFIX p: <http://www.wikidata.org/prop/>  \n'
                    + 'PREFIX pq: <http://www.wikidata.org/prop/qualifier/>  \n'
                    + 'PREFIX ps: <http://www.wikidata.org/prop/statement/>  \n'
                    + 'PREFIX wd: <http://www.wikidata.org/entity/>  \n'
                    + 'PREFIX wdt: <http://www.wikidata.org/prop/direct/>  \n'
                    + 'PREFIX wikibase: <http://wikiba.se/ontology#>  \n'
                    + ' \n'
                    + '#defaultView:BarChart \n'
                    + '# male/female population _must_ not be added unqualified as total population (!) \n'
                    + '# this is an error and should be fixed at the item using P1540 and P1539 instead \n'
                    + '# (wrong query result may be a manifestation of such) \n'
                    + 'SELECT ?year (AVG(?pop) AS ?population) ?countryLabel \n'
                    + '       (COUNT(*) AS ?number_of_chosen_sources) (SAMPLE(?method) AS ?a_source_of_those_chosen) \n'
                    + 'WHERE \n'
                    + '{ \n'
                    + '  ?country wdt:P31 wd:Q6256; \n'
                    + '           p:P1082 ?popStatement . \n'
                    + '  ?popStatement ps:P1082 ?pop; \n'
                    + '                pq:P585 ?date . \n'
                    + '  BIND(STR(YEAR(?date)) AS ?year) \n'
                    + '   \n'
                    + '  # IF multiple ?pop values per country per year exist, we prioritize by source \n'
                    + '  #       census 1st, others 2nd, estimation(s) 3rd, unknown sources (none supplies P459) last \n'
                    + '  # note wikibaserank won't help here each year may have multiple statements for ?pop value \n'
                    + '  #       rankprefered is used for the best value (or values) of the latest or current year \n'
                    + '  #       ranknormal may be justified for all of multiple ?pop values for a given year \n'
                    + '  OPTIONAL { ?popStatement pq:P459 ?method. } \n'
                    + '  OPTIONAL { ?country p:P1082 [ pq:P585 ?d; pq:P459 ?estimate ]. \n'
                    + '             FILTER(STR(YEAR(?d)) = ?year). FILTER(?estimate = wd:Q791801). } \n'
                    + '  OPTIONAL { ?country p:P1082 [ pq:P585 ?e; pq:P459 ?census ]. \n'
                    + '             FILTER(STR(YEAR(?e)) = ?year). FILTER(?census = wd:Q39825). } \n'
                    + '  OPTIONAL { ?country p:P1082 [ pq:P585 ?f; pq:P459 ?other ]. \n'
                    + '             FILTER(STR(YEAR(?f)) = ?year). FILTER(?other != wd:Q39825 && ?other != wd:Q791801). } \n'
                    + '  BIND(COALESCE(  \n'
                    + '    IF(BOUND(?census), ?census, 1/0), \n'
                    + '    IF(BOUND(?other), ?other, 1/0), \n'
                    + '    IF(BOUND(?estimate), ?estimate, 1/0) ) AS ?pref_method). \n'
                    + '  FILTER(IF(BOUND(?pref_method),?method = ?pref_method,true)) \n'
                    + '  # .. still need to group if multiple values per country per year exist and \n'
                    + '  # - none is qualified with P459 \n'
                    + '  # - multiple ?estimate or multiple ?census (>1 value from same source) \n'
                    + '  # - ?other yields more than one source (>1 values are better than optionally \n'
                    + '  #                         supplied estimate, but no census source available) \n'
                    + ' \n'
                    + '  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }                \n'
                    + '} \n'
                    + 'GROUP BY ?year ?countryLabel \n'
                    + 'ORDER BY ?year ?countryLabel \n';

            HashMap rs = sp.query(querySelect);
            printResult(rs,30);

        }catch(EndpointException eex) {
            System.out.println(eex);
            eex.printStackTrace();
        }
    }

    public static void printResult(HashMap rs , int size) {

      for (String variable : (ArrayList) rs.get("result").get("variables")) {
        System.out.print(String.format("%-"+size+"."+size+"s", variable ) + " | ");
      }
      System.out.print("\n");
      for (HashMap value : (ArrayList>) rs.get("result").get("rows")) {
        //System.out.print(value);
        /* for (String key : value.keySet()) {
         System.out.println(value.get(key));
         }*/
        for (String variable : (ArrayList) rs.get("result").get("variables")) {
          //System.out.println(value.get(variable));
          System.out.print(String.format("%-"+size+"."+size+"s", value.get(variable)) + " | ");
        }
        System.out.print("\n");
      }
    }
}
Project Github BorderCloud/SPARQL-JAVA
Very soon !
TODO