如何使用mysqli在查詢內獲得按月份的月份名稱？

Question

我試圖按月計算添加的記錄數。下面的查詢工作正常

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

但上面的查詢的結果將返回月份數，我希望得到月份名稱，如Jan，Feb而不是數量。我試過下面的技巧，但它不起作用。

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) 

任何人都可以指導我如何解決這個問題，我想感謝，如果有人指導我這一點。謝謝。

Answer 1

試試這個：

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：MONTHNAME(date)功能預計date作爲參數。

例子：

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

更多： 如果你想從數個月的名稱，那麼你可以使用STR_TO_DATE()將數字轉換爲日期，然後再回來MONTHNAME()

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

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