这个怎么样：
SELECT changes + changes1 + changes2 + changes3 changes28days, login, USEC_TO_TIMESTAMP(week)
FROM (
SELECT changes,
LAG(changes, 1) OVER (PARTITION BY login ORDER BY week) changes1,
LAG(changes, 2) OVER (PARTITION BY login ORDER BY week) changes2,
LAG(changes, 3) OVER (PARTITION BY login ORDER BY week) changes3,
login,
week
FROM (
SELECT SUM(payload_pull_request_changed_files) changes,
UTC_USEC_TO_WEEK(created_at, 1) week,
actor_attributes_login login,
FROM [publicdata:samples.github_timeline]
WHERE payload_pull_request_changed_files > 0
GROUP BY week, login
))
HAVING changes28days > 0
对于每个用户，它计算他们每周提交了多少更改。然后使用LAG（）我们可以窥视下一行，他们在-1，-2和-3周提交了多少更改。然后，我们只需要加上这4周的时间，就可以查看过去28天内提交了多少更改。
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