Difference between two timestamps in seconds in MySQL?

Let us now see the following methods to calculate the time difference between two timestamps in seconds.

Method

The following is the query to calculate the difference between two timestamps.

mysql> SELECT TIMESTAMPDIFF(SECOND, '2018-10-17 11:51:55', '2018-10-17 11:51:58');

The following is the output in seconds.

+---------------------------------------------------------------------+
| TIMESTAMPDIFF(SECOND, '2018-10-17 11:51:55', '2018-10-17 11:51:58') |
+---------------------------------------------------------------------+
|                                                                   3 |
+---------------------------------------------------------------------+
1 row in set (0.00 sec)

Method 2

The following is the query to calculate the difference between two timestamps with the help of UNIX Timestamp.

mysql>  SELECT UNIX_TIMESTAMP('2018-10-17 11:57:50') - UNIX_TIMESTAMP('2018-10-17 11:57:45') as DifferenceInSeconds;

The following is the output in seconds.

+---------------------+
| DifferenceInSeconds |
+---------------------+
|                   5 |
+---------------------+
1 row in set (0.00 sec)