每月选择

Question

我有下表：

purchases(id, item, user, price, time);

time字段为timestamp。

我需要一个每月返回一行的查询，该行将包含该月中每个项目的price总和。

Answer 1

试试这个：

SELECT MONTH(`time`) AS month, SUM(price) AS price
FROM your_table
GROUP BY MONTH(`time`)

如果您有一年以上的数据，您可能还希望将以下年份包含在您的论坛中：

SELECT YEAR(`time`) AS year, MONTH(`time`) AS month, SUM(price) AS price
FROM your_table
GROUP BY YEAR(`time`), MONTH(`time`)

Answer 2

GROUP BY YEAR(DATE(time)) ASC, MONTH(DATE(time)) ASC怎么办？