如何使用mysqli在查询中获取月份名称？

Question

我正在尝试按月添加记录数。以下查询工作正常

SELECT    COUNT(*) AS count_by_month, MONTH(date_added) AS in_month
FROM      `promotion` 
WHERE     YEAR(date_added) = '2016' 
GROUP BY  MONTH(date_added)

但是上面的查询是在结果中返回月份数字，我希望得到月份名称，如Jan，Feb而不是数字。我尝试了以下技巧，但它没有用。

    SELECT    COUNT(*) AS count_by_month, 
    MONTH(date_added) AS in_month, MONTHNAME(STR_TO_DATE(in_month, '%m'));
    FROM      `ws_promotion` 
    WHERE     YEAR(date_added) = '2016' 
    GROUP BY  MONTH(date_added)

任何人都可以指导我如何解决这个问题，如果有人指导我，我会很感激。谢谢。

Answer 1

试试这个：

SELECT    
    COUNT(*) AS count_by_month, 
    MONTH(date_added) AS in_month, 
    MONTHNAME(date_added)
FROM      `ws_promotion` 
WHERE     YEAR(date_added) = '2016' 
GROUP BY  MONTH(date_added)

注意： MONTHNAME(date)函数需要date作为参数。

示例：

mysql> SELECT MONTHNAME('2009-05-18');
+-------------------------+
| MONTHNAME('2009-05-18') |
+-------------------------+
| May                     | 
+-------------------------+
1 row in set (0.02 sec)

更多： 如果您想从数字中获取月份名称，则可以使用STR_TO_DATE()将数字转换为日期，然后返回MONTHNAME()

SELECT MONTHNAME(STR_TO_DATE(7, '%m'));

+---------------------------------+
| MONTHNAME(STR_TO_DATE(7, '%m')) |
+---------------------------------+
| July                            |
+---------------------------------+