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이예진: [SQL] Product Price at a Given Date_241126

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	`1`	`+SELECT`
	`2`	`+ DISTINCT p.product_id,`
	`3`	`+ CASE`
	`4`	`+ WHEN distinct_p.product_id IS NULL THEN 10`
	`5`	`+ ELSE p.new_price`
	`6`	`+ END AS price`
	`7`	`+FROM Products p`
	`8`	`+LEFT JOIN (`
	`9`	`+ SELECT product_id, MAX(change_date) change_date`
	`10`	`+ FROM Products`
	`11`	`+ WHERE change_date < '2019年08月17日'`
	`12`	`+ GROUP BY product_id`
	`13`	`+) sub`
	`14`	`+ON p.product_id = sub.product_id AND p.change_date = sub.change_date`
	`15`	`+LEFT JOIN (`
	`16`	`+ SELECT DISTINCT product_id`
	`17`	`+ FROM Products`
	`18`	`+ WHERE change_date < '2019年08月17日'`
	`19`	`+) distinct_p`
	`20`	`+ON p.product_id = distinct_p.product_id`
	`21`	`+WHERE sub.change_date IS NOT NULL OR distinct_p.product_id IS NULL`

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