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백제완: [SQL] Confirmation Rate_241018

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Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,9 @@`
	`1`	`+SELECT`
	`2`	`+ A.user_id`
	`3`	`+ , ROUND(AVG(IF(B.action = 'confirmed', 1, 0)), 2) confirmation_rate`
	`4`	`+FROM`
	`5`	`+ Signups A`
	`6`	`+ LEFT JOIN Confirmations B`
	`7`	`+ ON A.user_id = B.user_id`
	`8`	`+GROUP BY`
	`9`	`+ A.user_id`

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