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Share, discover and reuse the Linked Data has never been easier with a LinkedWiki Platform.

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://linkedwiki.com/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,curl_args=list(useragent=R.version.string))
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.*;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.HashMap;

public class Main {

    public static void main(String[] args) {
        try {
            URI endpoint = new URI("https://query.wikidata.org/sparql");
            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";
            SparqlClient sc = new SparqlClient(false);
            sc.setEndpointRead(endpoint);
            SparqlResult sr = sc.query(querySelect);
            //sc.printLastQueryAndResult();

            printResult(sr.getModel(),30);
        } catch (URISyntaxException | SparqlClientException e) {
            System.out.println(e);
            e.printStackTrace();
        }
    }

    public static void printResult(SparqlResultModel rs , int size) {
        for (String variable : rs.getVariables()) {
            System.out.print(String.format("%-"+size+"."+size+"s", variable ) + " | ");
        }
        System.out.print("\n");
        for (HashMap row : rs.getRows()) {
            for (String variable : rs.getVariables()) {
                System.out.print(String.format("%-"+size+"."+size+"s", row.get(variable)) + " | ");
            }
            System.out.print("\n");
        }
    }
}
For example, with Gradle :
apply plugin: 'java'
apply plugin: 'application'

// This comes out to package + '.' + mainClassName
mainClassName = 'Main'

group 'org.example'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
}
dependencies {
    compile "com.bordercloud:SPARQL-JAVA:[1.0,)"
}
Project Github BorderCloud/SPARQL-JAVA
Other SPARQL client : RDF4J
You can use the SPARQL clients in Java : BorderCloud/SPARQL-JAVA or RDF4J