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
FROM page 
WHERE page_namespace = 0 AND page_len BETWEEN 0 AND 1024 AND page_is_redirect = 0
ORDER BY RAND() LIMIT 50)
UNION ALL
(SELECT page_latest AS rev_id, page_title, page_len
FROM page 
WHERE page_namespace = 0 AND page_len BETWEEN 0 AND 1024 AND page_is_redirect = 0
ORDER BY RAND() LIMIT 50)
UNION ALL
(SELECT page_latest AS rev_id, page_title, page_len
FROM page 
WHERE page_namespace = 0 AND page_len BETWEEN 0 AND 1024 AND page_is_redirect = 0
ORDER BY RAND() LIMIT 50)
UNION ALL
(SELECT page_latest AS rev_id, page_title, page_len
FROM page 
WHERE page_namespace = 0 AND page_len BETWEEN 0 AND 1024 AND page_is_redirect = 0
ORDER BY RAND() LIMIT 50)
UNION ALL
(SELECT page_latest AS rev_id, page_title, page_len
FROM page 
WHERE page_namespace = 0 AND page_len BETWEEN 0 AND 1024 AND page_is_redirect = 0
ORDER BY RAND() LIMIT 50);
SQL

Checking query status...
