Question

我正在尝试根据月份名称订购一个mysql查询，但它按相反的顺序排序。我已经尝试了ASC和DESC订单但没有工作！这就是我得到的：

order_amount    month_number
370.245          Dec
0.01             Aug
0.02             July
0.01             May
2                Apr
3                Mar
4                Feb
5                Jan

这是查询：

select sum(amnt) as order_amount,month_number  from orders where paid =1 GROUP BY month_number   ORDER BY MONTH(month_number) ASC

这是我正在运行查询的示例表'order'

order_amount    month_number    paid

370.245           Jan             1

0.01              Aug             1
0.02              July            1
0.01              Apr             1
2                 May             0
3                 Mar             1
4                 Feb             0
5                 Nov             0

Answer 1

month_number()是该月份字符串名称的糟糕名称。也就是说，您的尝试无效，因为month()需要一个日期，而不是字符串表示。最好的方法可能只是使用case：

order by (case when month_number = 'Jan' then 1
               when month_number = 'Feb' then 2
               . . .
               when month_number = 'Dec' then 12
          end)

我强烈建议您在表格中包含日期或实际月份编号。并且，将month_number重命名为month_name。

Answer 2

根据您的示例，您在month_number字段中已经＆＃39; Dec＆＃39;＆＃39; 8月＆＃39; 等等。

如果您没有通过有效的日期类型，month(month_number)如何运作？如果您传递了一些随机文字，那么您只需获得NULL并且无法按NULL

排序

http://sqlfiddle.com/#!2/3a774d/3/0

http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_month

Answer 3

SELECT * FROM my_table;
+-------+
| month |
+-------+
| Apr   |
| Aug   |
| Dec   |
| Feb   |
| Jan   |
| Jul   |
| Jun   |
| Mar   |
| May   |
| Nov   |
| Oct   |
| Sep   |
+-------+

SELECT * FROM my_table ORDER BY STR_TO_DATE(CONCAT('2014-',month,'-01'),'%Y-%b-%d');
+-------+
| month |
+-------+
| Jan   |
| Feb   |
| Mar   |
| Apr   |
| May   |
| Jun   |
| Jul   |
| Aug   |
| Sep   |
| Oct   |
| Nov   |
| Dec   |
+-------+

......或类似的东西

按月排序，在Mysql中给出相反的顺序

3 个答案: