Random 7.5k sample of Wikidata items across different size strata

SQL

use wikidatawiki_p;

SELECT page_latest AS rev_id, page_title, page_len, "1024" as strata, 
FROM page 
WHERE page_namespace = 0 AND page_len BETWEEN 0 AND 1024 AND page_is_redirect = 0
ORDER BY RAND() LIMIT 1500;

SELECT page_latest AS rev_id, page_title, page_len, "8192" as strata
FROM page 
WHERE page_namespace = 0 AND page_len BETWEEN 1025 AND 8192 AND page_is_redirect = 0
ORDER BY RAND() LIMIT 1500;

SELECT page_latest AS rev_id, page_title, page_len, "131072" as strata
FROM page 
WHERE page_namespace = 0 AND page_len BETWEEN 8193 AND 131072 AND page_is_redirect = 0
ORDER BY RAND() LIMIT 1500;

SELECT page_latest AS rev_id, page_title, page_len, "262144" as strata
FROM page 
WHERE page_namespace = 0 AND page_len BETWEEN 131073 AND 262144 AND page_is_redirect = 0
ORDER BY RAND() LIMIT 1500;

SELECT page_latest AS rev_id, page_title, page_len, "inf" as strata
FROM page 
WHERE page_namespace = 0 AND page_len >= 262145 AND page_is_redirect = 0
ORDER BY RAND() LIMIT 1500;
SQL

Checking query status...
