Calculating the congruence between languages

This query is marked as a draft This query has been published by Livnetata.

Counting the number of articles that appear in two languages (for all languages).
Using wikidata wb_items_per_site table.

SQL

USE wikidatawiki_p;

SELECT * FROM
(SELECT * FROM wb_items_per_site WHERE ips_item_id = 42 AND ips_site_id LIKE '%wiki') as A LEFT JOIN
(SELECT * FROM wb_items_per_site WHERE ips_item_id = 42 AND ips_site_id LIKE '%wiki') as B
ON A.ips_item_id = B.ips_item_id
WHERE A.ips_site_id < B.ips_site_id;

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