Non-bot revisions and typed commend length average per day

SQL

SELECT
    COUNT(rc_bot) AS num_revisions,
    AVG(true_comment_length) AS avg_comment_length,
    AVG(num_revisions_per_day) AS avg_revisions_per_day
FROM (
    SELECT
        rc.rc_bot,
        cr.comment_text,
        LENGTH(
            -- Remove /* */ comments from the comment_text
            REGEXP_REPLACE(cr.comment_text, '/\\*.*?\\*/', '') 
        ) AS true_comment_length,
        DATE(FROM_UNIXTIME(rc.rc_timestamp)) AS revision_date,
        COUNT(*) AS num_revisions_per_day
    FROM
        recentchanges rc
    JOIN
        comment_recentchanges cr ON rc.rc_comment_id = cr.comment_id
    WHERE
        rc.rc_bot <> 1 AND
        rc.rc_source = "mw.edit" AND
        NOT cr.comment_text LIKE 'Undid revision%' AND
        NOT cr.comment_text LIKE 'Restored revision%' AND
        rc.rc_timestamp >= UNIX_TIMESTAMP(CURDATE() - INTERVAL 10 DAY) AND
        rc.rc_timestamp < UNIX_TIMESTAMP(CURDATE())
    GROUP BY
        revision_date
) AS latest_non_bot_revisions;
SQL

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