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