Deletions by month and reason

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

The number of deletions in each month since the deletion log began in December 2004, with an attempt to classify the type of deletion based on the log comment.

Deletion reasons are non-overlapping, and earlier ones take precedence.  For example, a log comment of '[[WP:CSD#G4|G4]]: Recreation of a page that was [[WP:DEL|deleted]] per a [[WP:XFD|deletion discussion]]: [[Wikipedia:Articles for deletion/Example]]' would be counted as 'Other speedy' and not as 'AFD'; and one of 'Multiple reasons: speedy deletion criteria [[WP:U5|U5]], [[WP:G11|G11]]' would be 'G11' and not as 'Other speedy'.

'redirect overwrites' is classified using the separate log_actions of 'delete_redir' and 'delete_redir2' instead of the log comment, so it's only accurate to when they were introduced in December 2016.

For [[WP:RAQ#number of deletions]] circa 2023 Dec 3.

SQL

SELECT yyyymm,
       SUM(reason = 'redir') AS 'redirect overwrites',
       SUM(reason = 'a7+g11') AS 'A7 and G11',
       SUM(reason = 'a7') AS 'A7',
       SUM(reason = 'g11') AS 'G11',
       SUM(reason = 'speedy') AS 'Other speedy',
       SUM(reason = 'afd') AS 'AFD',
       SUM(reason = 'cfd') AS 'CFD',
       SUM(reason = 'rfd') AS 'RFD',
       SUM(reason = 'tfd') AS 'TFD',
       SUM(reason = 'ffd') AS 'FFD',
       SUM(reason = 'mfd') AS 'MFD',
       SUM(reason = 'prod') AS 'prod',
       SUM(reason = 'unparsed') AS 'unparsed',
       COUNT(*) AS 'total'
FROM
(
  -- this irritating subquery mostly so we can ensure no deletion is classified as more than one reason,
  -- without having to repeat each previous condition
  SELECT CONCAT(LEFT(log_timestamp, 4), '-', SUBSTR(log_timestamp, 5, 2)) AS 'yyyymm',
         CASE
           WHEN log_action != 'delete' THEN 'redir'
           WHEN comment_text RLIKE '(?i)(^|\\[\\[)((WP|Wikipedia):)?(CSD[#_ ]?)?[GARFICUT][_ ]?1?[0-9]\\b'
             THEN CASE WHEN comment_text RLIKE '(?i)\\ba7\\b' AND comment_text RLIKE '(?i)\\bg11\\b' THEN 'a7+g11'
                       WHEN comment_text RLIKE '(?i)\\ba7\\b' THEN 'a7'
                       WHEN comment_text RLIKE '(?i)\\bg11\\b' THEN 'g11'
                       ELSE 'speedy'
                  END
           WHEN comment_text RLIKE '(?i)(\\[\\[(WP|Wikipedia):(Votes|Articles)[_ ]for[_ ]deletion/|\\b[av]fd\\b)' THEN 'afd'
           WHEN comment_text RLIKE '(?i)(\\[\\[(WP|Wikipedia):Categories[_ ]for[_ ](deletion|discussion)/|\\bcfd\\b)' THEN 'cfd'
           WHEN comment_text RLIKE '(?i)(\\[\\[(WP|Wikipedia):Redirects[_ ]for[_ ](deletion|discussion)/|\\brfd\\b)' THEN 'rfd'
           WHEN comment_text RLIKE '(?i)(\\[\\[(WP|Wikipedia):Templates[_ ]for[_ ](deletion|discussion)/|\\btfd\\b)' THEN 'tfd'
           WHEN comment_text RLIKE '(?i)(\\[\\[(WP|Wikipedia):(Files|Images)[_ ]for[_ ](deletion|discussion)/|\\b[fi]fd\\b)' THEN 'ffd'
           WHEN comment_text RLIKE '(?i)(\\[\\[(WP|Wikipedia):Miscellany[_ ]for[_ ]deletion/|\\bmfd\\b)' THEN 'mfd'
           WHEN comment_text RLIKE '(?i)(\\bprod\\b|proposed deletion)' THEN 'prod'
           ELSE 'unparsed'
         END AS reason,
         comment_text
  FROM logging
  LEFT JOIN comment_logging ON comment_id = log_comment_id
  WHERE log_type = 'delete' AND log_action IN ('delete', 'delete_redir', 'delete_redir2')
) sq
GROUP BY yyyymm;

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