日期類報表數據開發小例1

原表 要求： 每天的取最大值cnt的前三個top 3 代碼實現： SELECT a.* FROM city_top a LEFT JOIN city_top b ON a.date = b.date AND a.cnt < b.cnt GROUP BY a.date, a.city, a.cnt HAVING count(b.date) < 3 ORDER BY a.date, a.cnt DES

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