Untitled query #87493

This query is marked as a draft This query has been published by Rpi153.

SQL

SELECT SUM(rev.rev_len - COALESCE(parent.rev_len, 0)) AS total_len_difference
FROM revision rev
LEFT JOIN revision parent ON rev.rev_parent_id = parent.rev_id
WHERE rev.rev_timestamp LIKE '2006%'
GROUP BY rev.rev_page;

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