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백제완: [SQL] Product Price at a Given Date_241205

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SQL/13주차
- JW_Product_Price_at_a_Given_Date.sql

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`‎SQL/13주차/JW_Product_Price_at_a_Given_Date.sql‎`

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	`1`	`+WITH CTE AS (`
	`2`	`+ SELECT`
	`3`	`+ product_id`
	`4`	`+ , new_price`
	`5`	`+ FROM`
	`6`	`+ products`
	`7`	`+ WHERE`
	`8`	`+ (product_id, change_date) IN`
	`9`	`+ (`
	`10`	`+ SELECT`
	`11`	`+ product_id`
	`12`	`+ , MAX(change_date)`
	`13`	`+ FROM`
	`14`	`+ Products`
	`15`	`+ WHERE`
	`16`	`+ change_date <= '2019年08月16日'`
	`17`	`+ GROUP BY`
	`18`	`+ product_id`
	`19`	`+ )`
	`20`	`+)`
	`21`	`+`
	`22`	`+SELECT`
	`23`	`+ DISTINCT(A.product_id)`
	`24`	+ , IFNULL(B.new_price, 10) `price`
	`25`	`+FROM`
	`26`	`+ products A`
	`27`	`+ LEFT JOIN CTE B`
	`28`	`+ ON A.product_id = B.product_id`

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