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이지영: [SQL] Montly Transaction 1_250124

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	`1`	`+-- 1193. Monthly Transactions I`
	`2`	`+-- https://leetcode.com/problems/monthly-transactions-i/`
	`3`	`+SELECT DATE_FORMAT(trans_date, "%Y-%m") AS month, country`
	`4`	`+ , COUNT(*) AS trans_count`
	`5`	`+ , COUNT(IF(state = 'approved', state, NULL)) AS approved_count`
	`6`	`+ , SUM(amount) AS trans_total_amount`
	`7`	`+ , SUM(IF(state = 'approved', amount, 0)) AS approved_total_amount`
	`8`	`+FROM TRANSACTIONS`
	`9`	`+GROUP BY YEAR(trans_date), MONTH(trans_date), country`

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