解答
132
SQL文(クエリ)
WITH master AS (
SELECT
cid
, MAX(user_id) AS user_id2
FROM
sample.web_log
GROUP BY
cid
)
SELECT
user_id2
, COUNT(*) AS pageview
FROM
sample.web_log
JOIN master
USING
(cid)
GROUP BY
user_id2
HAVING user_id2 IS NOT NULL
ORDER BY
pageview DESC
LIMIT 3



