MySQL 如何检查now()是否处于两个具体日期之间

这里，now()表示当前日期。要检查它是否介于两个特定日期之间，需要使用BETWEEN。让我们首先创建一个表 –

mysql> create table DemoTable
   (
   FirstDate datetime,
   SecondDate datetime
   );
Query OK, 0 rows affected (0.60 sec)

使用insert命令在表中插入一些记录 –

mysql> insert into DemoTable values('2019-04-01','2019-05-02');
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable values('2019-05-28','2019-06-04');
Query OK, 1 row affected (0.27 sec)
mysql> insert into DemoTable values('2016-01-31','2019-03-01');
Query OK, 1 row affected (0.15 sec)

使用select语句显示表中的所有记录 –

mysql> select *from DemoTable;

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输出

+-----------------------+-----------------------+
| FirstDate             | SecondDate            |
+-----------------------+-----------------------+
| 2019-04-01 00 :00 :00 | 2019-05-02 00 :00 :00 |
| 2019-05-28 00 :00 :00 | 2019-06-04 00 :00 :00 |
| 2016-01-31 00 :00 :00 | 2019-03-01 00 :00 :00 |
+-----------------------+-----------------------+
3 rows in set (0.00 sec)

以下是检查now()是否落在两个特定日期之间的查询 –

mysql> select *from DemoTable where now() BETWEEN FirstDate AND SecondDate;

输出

+-----------------------+-----------------------+
| FirstDate             | SecondDate            |
+-----------------------+-----------------------+
| 2019-05-28 00 :00 :00 | 2019-06-04 00 :00 :00 |
+-----------------------+-----------------------+
1 row in set (0.00 sec)