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MySQL BETWEEN 子句

BETWEEN 子句可以代替“大于等于XX,并且小于等于XX”这样的条件。

为了理解 BETWEEN 子句,依旧来看 employee_tbl 这个例子,它的所有记录如下:

mysql> SELECT * FROM employee_tbl;
+------+------+------------+--------------------+
| id   | name | work_date  | daily_typing_pages |
+------+------+------------+--------------------+
|    1 | John | 2007-01-24 |                250 |
|    2 | Ram  | 2007-05-27 |                220 |
|    3 | Jack | 2007-05-06 |                170 |
|    3 | Jack | 2007-04-06 |                100 |
|    4 | Jill | 2007-04-06 |                220 |
|    5 | Zara | 2007-06-06 |                300 |
|    5 | Zara | 2007-02-06 |                350 |
+------+------+------------+--------------------+
7 rows in set (0.00 sec)

假设要从上表中获取 daily_typing_pages 大于或等于170,小于或等于300的数据。可以利用 >=<= 条件来实现。

mysql>SELECT * FROM employee_tbl 
    ->WHERE daily_typing_pages >= 170 AND
    ->daily_typing_pages <= 300;
+------+------+------------+--------------------+
| id   | name | work_date  | daily_typing_pages |
+------+------+------------+--------------------+
|    1 | John | 2007-01-24 |                250 |
|    2 | Ram  | 2007-05-27 |                220 |
|    3 | Jack | 2007-05-06 |                170 |
|    4 | Jill | 2007-04-06 |                220 |
|    5 | Zara | 2007-06-06 |                300 |
+------+------+------------+--------------------+
5 rows in set (0.03 sec)

BETWEEN 实现起来就简单多了,如下所示:

mysql> SELECT * FROM employee_tbl 
    -> WHERE daily_typing_pages BETWEEN 170 AND 300; 
+------+------+------------+--------------------+
| id   | name | work_date  | daily_typing_pages |
+------+------+------------+--------------------+
|    1 | John | 2007-01-24 |                250 |
|    2 | Ram  | 2007-05-27 |                220 |
|    3 | Jack | 2007-05-06 |                170 |
|    4 | Jill | 2007-04-06 |                220 |
|    5 | Zara | 2007-06-06 |                300 |
+------+------+------------+--------------------+
5 rows in set (0.03 sec)
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