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배수빈: [SQL] Immediate Food Delivery II

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	`1`	`+SELECT ROUND(AVG(order_date = customer_pref_delivery_date)*100,2) as immediate_percentage`
	`2`	`+FROM Delivery`
	`3`	`+WHERE (customer_id, order_date) in (`
	`4`	`+ SELECT customer_id, min(order_date)`
	`5`	`+ FROM Delivery`
	`6`	`+ GROUP BY customer_id`
	`7`	`+)`

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