3
我試圖按時間對一些結果進行排序。我收集str_to_date是要走的路,但我似乎使用它錯了,我不能確定,但我認爲它轉換爲NULL,然後不以有意義的方式排序:str_to_date在查詢中返回null,但它本身很好
mysql> SELECT member_id, result_result, str_to_date('result_result','%i:%s.%f') FROM results WHERE workout_id = '2' ORDER BY str_to_date('result_result','%i:%s.%f') LIMIT 5;
+-----------+---------------+-----------------------------------------+
| member_id | result_result | str_to_date('result_result','%i:%s.%f') |
+-----------+---------------+-----------------------------------------+
| 0 | 1:35.0 | NULL |
| 1 | 1:35.0 | NULL |
| 3 | 1:40 | NULL |
| 4 | 1:37.8 | NULL |
| 7 | 1:27.3 | NULL |
+-----------+---------------+-----------------------------------------+
5 rows in set, 5 warnings (0.00 sec)
但兩個結果類型似乎轉換,如果我做手工精細:
mysql> select str_to_date('1:40','%i:%s.%f');
+--------------------------------+
| str_to_date('1:40','%i:%s.%f') |
+--------------------------------+
| 00:01:40 |
+--------------------------------+
1 row in set (0.00 sec)
mysql> select str_to_date('1:35.0','%i:%s.%f');
+----------------------------------+
| str_to_date('1:35.0','%i:%s.%f') |
+----------------------------------+
| 00:01:35 |
+----------------------------------+
1 row in set (0.00 sec)
任何想法發生了什麼/如何解決呢? 謝謝!
冠軍!感謝那! – user2481801