count of ncbi externallinks by path for pages in W

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

SQL

SET @hostname_regex = '^([^:/?#]+:)?(\/+([^/?#:]*))?([^\?#]*)\?.*';

SELECT
  REGEXP_SUBSTR(
    REGEXP_REPLACE(
      LOWER(CONVERT(el_to USING utf8)),
      @hostname_regex,
      '\\4'
    ),
    '(/[^/]+)'
  ) AS path,
  COUNT(*) AS num_links
FROM
  externallinks
WHERE
  el_to LIKE '%.ncbi.nlm.nih.gov/%'
  AND el_from <= 10000
GROUP BY
  path
ORDER BY
  count DESC;

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