Distinct list of domain names of external links used on enwiki

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

SQL

USE enwiki_p;
SELECT COUNT(
  DISTINCT
  LEFT(REPLACE(REPLACE(el_to, 'http://', ''), 'https://', ''), LOCATE('/', REPLACE(REPLACE(el_to, 'http://', ''), 'https://', '')) - 1)
)
FROM externallinks;

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SQL

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