题目链接：点击打开链接
题目大意：略。
解题思路：略。
AC 代码
SELECt DATE_FORMAT(order_date, '%Y-%m') month, COUNT(*) order_count, COUNT(DISTINCT customer_id) customer_count FROM Orders WHERe invoice > 20 GROUP BY month
题目链接：点击打开链接
题目大意：略。
解题思路：略。
AC 代码
SELECt DATE_FORMAT(order_date, '%Y-%m') month, COUNT(*) order_count, COUNT(DISTINCT customer_id) customer_count FROM Orders WHERe invoice > 20 GROUP BY month
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