Top domains used in external links (eswiki, main namespace) v1

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

This query shows domains used in external links from the main namespace of Spanish Wikipedia, along with a count of how many links they appear in, as well as the number of articles containing, at least, one link to the domain.

Domains are simplified to the main domain:
* news.bbc.com -> bbc.com
* news.bbc.co.uk -> bbc.co.uk
* www.dover.nj.us -> dover.nj.us

Top 2000 are shown, according to number of articles containing links to the domain.

SQL

USE eswiki_p;
SELECT
	el_from AS page_id,
    CAST(
		SUBSTRING_INDEX(SUBSTRING_INDEX(SUBSTRING_INDEX(SUBSTRING_INDEX(SUBSTRING_INDEX(el_to, '/', 3), '://', -1), '/', 1), '?', 1), ':', 1)
	AS CHAR(1000) CHARACTER SET utf8) AS domain
FROM externallinks
WHERE
	-- Only links from main namespace articles
	el_from_namespace = 0
    -- Get only fairly well-formed URLs for http and https
    -- and exclude IPv4
	AND el_to REGEXP '^https?://[[:alnum:]]+\..*[[:alpha:]].*'
LIMIT 10;

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