MySQL中两个时间戳相差多少秒?


您可以使用MySQL的内置函数UNIX_TIMESTAMP()获取时间戳以及两个时间戳之间的差值。语法如下:

SELECT UNIX_TIMESTAMP(yourColumnName1) - UNIX_TIMESTAMP(yourColumnName2) as anyVariableName from yourTableName;

为了理解上述概念,让我们创建一个表。以下是创建表的查询:

mysql> create table DifferenceInSeconds
   −> (
   −> FirstTimestamp TIMESTAMP,
   −> SecondTimestamp TIMESTAMP
   −> );
Query OK, 0 rows affected (0.93 sec)

使用insert命令在表中插入一些记录。查询如下:

mysql> insert into DifferenceInSeconds values('2012-12-12 13:16:55','2012-12-12 13:13:55');
Query OK, 1 row affected (0.31 sec)

mysql> insert into DifferenceInSeconds values('2014-10-11 12:15:50','2014-10-11 12:13:50');
Query OK, 1 row affected (0.19 sec)

mysql> insert into DifferenceInSeconds values('2018-12-14 13:30:53','2018-12-14 13:27:53');
Query OK, 1 row affected (0.21 sec)

现在使用select语句显示表中的所有记录。查询如下:

mysql> select *from DifferenceInSeconds;

以下是输出:

+---------------------+---------------------+
| FirstTimestamp      | SecondTimestamp     |
+---------------------+---------------------+
| 2012-12-12 13:16:55 | 2012-12-12 13:13:55 |
| 2014-10-11 12:15:50 | 2014-10-11 12:13:50 |
| 2018-12-14 13:30:53 | 2018-12-14 13:27:53 |
+---------------------+---------------------+
3 rows in set (0.00 sec)

以下是查找两个时间戳之间以秒为单位的差值的查询。查询如下:

mysql> SELECT UNIX_TIMESTAMP(FirstTimestamp) - UNIX_TIMESTAMP(SecondTimestamp) as Seconds from DifferenceInSeconds;

以下是输出:

+---------+
| Seconds |
+---------+
|     180 |
|     120 |
|     180 |
+---------+
3 rows in set (0.00 sec)

注意 - 如果您不知道哪个时间戳更大,请使用ABS()。

语法如下:

SELECT ABS(UNIX_TIMESTAMP(yourColumnName1) - UNIX_TIMESTAMP(yourColumnName2)) as Seconds from DifferenceInSeconds;

为了检查上述语法,让我们插入第一个时间戳值较低的记录。

mysql> insert into DifferenceInSeconds values('2018-12-14 13:26:53','2018-12-14 13:31:53');
Query OK, 1 row affected (0.21 sec)

显示表中所有记录的查询。

mysql> select *from DifferenceInSeconds;

以下是输出:

+---------------------+---------------------+
| FirstTimestamp      | SecondTimestamp     |
+---------------------+---------------------+
| 2012-12-12 13:16:55 | 2012-12-12 13:13:55 |
| 2014-10-11 12:15:50 | 2014-10-11 12:13:50 |
| 2018-12-14 13:30:53 | 2018-12-14 13:27:53 |
| 2018-12-14 13:26:53 | 2018-12-14 13:31:53 |
+---------------------+---------------------+
4 rows in set (0.00 sec)

以下是ABS()函数的用法。查询如下:

mysql> SELECT ABS(UNIX_TIMESTAMP(FirstTimestamp) - UNIX_TIMESTAMP(SecondTimestamp)) as Seconds from DifferenceInSeconds;

以下是输出:

+---------+
| Seconds |
+---------+
|     180 |
|     120 |
|     180 |
|     300 |
+---------+
4 rows in set (0.00 sec)

注意 - 如果不使用ABS(),则上述输出将为-300秒。

更新于:2019年7月30日

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