Question

 WHERE
  order_customFields.order_customFields_order_date >= '2016-12-01' AND
  order_customFields.order_customFields_order_date <= '2016-12-31'

如何选择上个月的数据，而非当前日期 - 30天？例如，在1月的任何一天，它总是从1dec到31dec。

Answer 1

这是一种方法：

WHERE order_customFields.order_customFields_order_date >= date_sub(date_sub(curdate(), interval day(curdate()) - 1 day), interval 1 month) and
      order_customFields.order_customFields_order_date < date_sub(curdate(), interval day(curdate()) - 1 day)

请注意，表达式：date_sub(curdate(), interval day(curdate()) - 1 day)将返回当月的第一天。

Answer 2

E.g：

SELECT * FROM my_table;
+------------+
| dt         |
+------------+
| 2016-11-01 |
| 2016-11-04 |
| 2016-11-06 |
| 2016-11-07 |
| 2016-11-09 |
| 2016-11-10 |
| 2016-11-12 |
| 2016-11-13 |
| 2016-11-14 |
| 2016-11-15 |
| 2016-11-16 |
| 2016-11-17 |
| 2016-11-18 |
| 2016-11-19 |
| 2016-11-20 |
| 2016-11-21 |
| 2016-11-22 |
| 2016-11-23 |
| 2016-11-24 |
| 2016-11-25 |
| 2016-11-26 |
| 2016-11-28 |
| 2016-12-01 |
| 2016-12-03 |
| 2016-12-04 |
| 2016-12-07 |
| 2016-12-11 |
| 2016-12-13 |
| 2016-12-15 |
| 2016-12-18 |
| 2016-12-19 |
| 2016-12-22 |
| 2016-12-25 |
| 2016-12-28 |
| 2017-01-01 |
| 2017-01-04 |
| 2017-01-07 |
| 2017-01-11 |
| 2017-01-14 |
| 2017-01-15 |
| 2017-01-16 |
| 2017-01-19 |
+------------+

SELECT * 
  FROM my_table 
 WHERE dt BETWEEN DATE_FORMAT(CURDATE()-INTERVAL 1 MONTH,'%Y-%m-01') 
              AND LAST_DAY(CURDATE()-INTERVAL 1 MONTH);
+------------+
| dt         |
+------------+
| 2016-12-01 |
| 2016-12-03 |
| 2016-12-04 |
| 2016-12-07 |
| 2016-12-11 |
| 2016-12-13 |
| 2016-12-15 |
| 2016-12-18 |
| 2016-12-19 |
| 2016-12-22 |
| 2016-12-25 |
| 2016-12-28 |
+------------+

选择上个月

2 个答案: