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이지영: [SQL] Confirmation Rate_241211

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	`1`	`+-- 1934. Confirmation Rate`
	`2`	`+-- https://leetcode.com/problems/confirmation-rate/`
	`3`	`+SELECT a.user_id`
	`4`	`+ , CASE`
	`5`	`+ WHEN COUNT(IF(action = "confirmed", a.user_id, null)) = 0 THEN round(0, 2)`
	`6`	`+ ELSE ROUND(COUNT(IF(action = "confirmed", a.user_id, null)) / count(*), 2)`
	`7`	`+ END AS confirmation_rate`
	`8`	`+FROM signups a`
	`9`	`+LEFT JOIN confirmations b`
	`10`	`+ON a.user_id = b.user_id`
	`11`	`+GROUP BY a.user_id`

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