将sql查询分组为季度结果

Question

我正在尝试将一组结果分组到季度年度结果中。到目前为止，我已经设法提出这个查询，按月显示视图：

SELECT DATE_FORMAT(post_date, '%b-%y') AS Month, SUM(views) AS Views
FROM $table
WHERE `property_id` = $property_id
GROUP BY DATE_FORMAT(post_date, '%b-%y')
ORDER BY `post_date` ASC

...这给了我以下数据：

Month   Views
Jan-16  331
Feb-16  390
Mar-16  431
Apr-16  430
May-16  364
Jun-16  360
Jul-16  459
Aug-16  356
Sep-16  530
Oct-16  435
Nov-16  376
Dec-16  362

我不确定如何对它们进行分组，以便包含三个月的内容计算该季度末的观点和输出。例如，使用上面的数据：

Month   Views
Mar-16  1152
Jun-16  1154
Sep-16  1345
Dec-16  1173

任何建议表示赞赏，谢谢。

更新感谢Thorsten Kettner解决这个问题。我还在下面添加了他的解决方案，以按月 - 年格式获取我需要的列，如下所示：

SELECT DATE_FORMAT(MAX(post_date), '%b-%y') AS Month, QUARTER(post_date), SUM(views) AS Views
FROM $table
WHERE property_id = $property_id
GROUP BY YEAR(post_date), QUARTER(post_date) 
ORDER BY YEAR(post_date), QUARTER(post_date)

Answer 1

可以使用月份编号的整数除法计算季度：

SELECT YEAR(post_date), (MONTH(post_date) - 1) DIV 3 + 1 as quarter, SUM(views) AS Views
FROM $table
WHERE property_id = $property_id
GROUP BY YEAR(post_date), (MONTH(post_date) - 1) DIV 3 + 1
ORDER BY YEAR(post_date), (MONTH(post_date) - 1) DIV 3 + 1;

正如M Khalid Junaid所说：有一个函数QUARTER：

SELECT YEAR(post_date), QUARTER(post_date), SUM(views) AS Views
FROM $table
WHERE property_id = $property_id
GROUP BY YEAR(post_date), QUARTER(post_date) 
ORDER BY YEAR(post_date), QUARTER(post_date);