MySQL查询：如何获得时间差

首先我们需要创建一个表 −

mysql> create table DemoTable1570
   -> (
   -> ArrivalTime datetime
   -> );
Query OK, 0 rows affected (0.87 sec)

使用insert命令将一些记录插入到表中 −

mysql> insert into DemoTable1570 values('2019-10-15 5:10:00');
Query OK, 1 row affected (0.25 sec)
mysql> insert into DemoTable1570 values('2019-10-15 23:00:00');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable1570 values('2019-10-15 23:10:00');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable1570 values('2019-10-15 16:10:00');
Query OK, 1 row affected (0.15 sec)

使用select语句从表中显示所有记录−

mysql> select * from DemoTable1570;

这将产生以下输出

+---------------------+
| ArrivalTime         |
+---------------------+
| 2019-10-15 05:10:00 |
| 2019-10-15 23:00:00 |
| 2019-10-15 23:10:00 |
| 2019-10-15 16:10:00 |
+---------------------+
4 rows in set (0.00 sec)

当前日期如下 −

mysql> select now();
+---------------------+
| now()               |
+---------------------+
| 2019-10-15 22:26:14 |
+---------------------+
1 row in set (0.00 sec)

以下是获取时间差的查询语句−

mysql> select * from DemoTable1570
   -> where ArrivalTime > now() - interval 5 hour;

这将产生以下输出

+---------------------+
| ArrivalTime         |
+---------------------+
| 2019-10-15 23:00:00 |
| 2019-10-15 23:10:00 |
+---------------------+
2 rows in set (0.00 sec)

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