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SQL

AخA
 
SELECT SUM(total_bytes_changed) AS sum_total_bytes_changed
FROM (
  SELECT rc_new_len - rc_old_len AS total_bytes_changed
  FROM recentchanges 
  JOIN page ON recentchanges.rc_cur_id = page.page_id 
  WHERE page.page_namespace = 0 
    AND recentchanges.rc_timestamp >= DATE_SUB(NOW(), INTERVAL 1 WEEK)
) AS subquery;
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