wikidata: number of items per Q-ID bin

SQL

-- https://www.mediawiki.org/wiki/Manual:Database_layout
-- note: the page table does not contain Q-IDs that have been deleted (or never been created)

USE wikidatawiki_p;

-- number of redirects: use WQS
-- number of empty items: use WQS

-- total number of item in bin: (rest may have been deleted, or never created)
SELECT CEILING(SUBSTRING(page_title FROM 2) / 500000) AS bin, COUNT(*) AS cnt FROM page WHERE page_namespace=0 GROUP BY bin ORDER BY bin ASC;

-- number of items that have been deleted once (regardless of whether they have been restored):
-- SELECT DISTINCT log_title FROM logging WHERE log_namespace=0 AND log_type='delete'

-- pages that have been deleted, and not been restored
-- SELECT DISTINCT log_title FROM logging WHERE log_namespace=0 AND log_type='delete' AND log_title NOT IN (SELECT page_title FROM page WHERE page_namespace=0)
-- SELECT CEILING(SUBSTRING(log_title FROM 2) / 100000) AS bin, COUNT(*) AS cnt FROM logging WHERE log_namespace=0 AND log_type='delete' AND log_title NOT IN (SELECT page_title FROM page WHERE page_namespace=0)

-- SELECT ?bin (COUNT(*) AS ?cnt) WHERE {
--   #?item wikibase:statements 0 .
--   #?item owl:sameAs [] .
--   ?item wikibase:sitelinks [] .
--   BIND(ceil(xsd:integer(SUBSTR(STR(?item),33)) / 100000) AS ?bin) .
-- } GROUP BY ?bin ORDER BY ASC(?bin)
SQL

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