解答
135
SQL文(クエリ)
WITH master AS (
SELECT
CONCAT(cid, session_count) AS session_id
, MAX(IF( page = "/cart/", 1, 0)) AS cart_reach
, MAX(IF( page = "/thank_you/", 1, 0)) AS cv
FROM
sample.web_log
GROUP BY
session_id
)
SELECT
SUM(cv) / SUM(cart_reach) AS cart_completion_rate
FROM
master



