Question

我有一种奇怪的行为，如果有人能解释一下，我会很高兴吗？今天是2016年5月22日（对于未来的读者）。

SELECT `Opened`,
  `Milestone_Status`,
  Year(`Opened`), 
  Month(`Opened`), 
  Count(*) As Total_Rows 
FROM Cases 
WHERE `Opened` BETWEEN (CURRENT_DATE() - INTERVAL 6 MONTH) AND (CURRENT_DATE() - INTERVAL 2 MONTH) 
GROUP BY Year(`Opened`), Month(`Opened`), `Milestone_Status`;

结果如下：

+------------+------------------+----------------+-----------------+------------+
| Opened     | Milestone_Status | Year(`Opened`) | Month(`Opened`) | Total_Rows |
+------------+------------------+----------------+-----------------+------------+
| 2016-12-07 | Compliant        |           2016 |              12 |          2 |
| 2017-01-10 | Compliant        |           2017 |               1 |          6 |
| 2017-02-23 | Closed Violation |           2017 |               2 |          1 |
| 2017-02-27 | Compliant        |           2017 |               2 |          1 |
| 2017-03-01 | Closed Violation |           2017 |               3 |          1 |
| 2017-03-06 | Compliant        |           2017 |               3 |          2 |
+------------+------------------+----------------+-----------------+------------+
6 rows in set (0.02 sec)

因此，当我将一个月的差异从2更改为3时，它应该显示直到月份的行（＆＃39;已打开＆＃39;）2，但是..

SELECT `Opened`,
  `Milestone_Status`,
  Year(`Opened`), 
  Month(`Opened`), 
  Count(*) As Total_Rows 
FROM Cases WHERE `Opened` BETWEEN (CURRENT_DATE() - INTERVAL 6 MONTH) AND (CURRENT_DATE() - INTERVAL 3 MONTH) 
GROUP BY Year(`Opened`), Month(`Opened`), `Milestone_Status`;

result:
+------------+------------------+----------------+-----------------+------------+
| Opened     | Milestone_Status | Year(`Opened`) | Month(`Opened`) | Total_Rows |
+------------+------------------+----------------+-----------------+------------+
| 2016-12-07 | Compliant        |           2016 |              12 |          2 |
| 2017-01-10 | Compliant        |           2017 |               1 |          6 |
+------------+------------------+----------------+-----------------+------------+
2 rows in set (0.01 sec)

任何想法，更好的方法，请？

Answer 1

不，输出正确。正如

 CURRENT_DATE() - INTERVAL 3 MONTH

是

2017年2月22日

所以你查询成为：

SELECT `Opened`,`Milestone_Status`,YEAR(`Opened`), MONTH(`Opened`), 
COUNT(*) AS Total_Rows
FROM Cases WHERE `Opened`
BETWEEN (2016-11-22) AND (2017-02-22)
GROUP BY YEAR(`Opened`), MONTH(`Opened`), `Milestone_Status`;

Answer 2

因此，当我将一个月的差异从2更改为3时，它应该显示直到月份（'已打开'）2的行，但是..

因为今天是22岁所以你的结果是真的。

如果您想从2获得月份（'已打开'），请使用月份。

使用DATEADD（）

编辑：CURRENT_DATE

Ex：3个月：DATEADD（m，-3，GETDATE（））。

希望它会对你有所帮助。

MySQL：BETWEEN - 查询中的结果不同

2 个答案: