MySQL Select where timestamp is in the current hour?

For this, you can use CURTIME(). Let us first create a table −

mysql> create table DemoTable
   -> (
   -> ArrivalTime timestamp
   -> );
Query OK, 0 rows affected (0.65 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('2019-10-26 17:55:55');
Query OK, 1 row affected (0.46 sec)
mysql> insert into DemoTable values('2019-10-26 18:00:00');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable values('2019-10-26 18:55:00');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values('2018-10-26 16:00:10');
Query OK, 1 row affected (0.20 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+---------------------+
| ArrivalTime         |
+---------------------+
| 2019-10-26 17:55:55 |
| 2019-10-26 18:00:00 |
| 2019-10-26 18:55:00 |
| 2018-10-26 16:00:10 |
+---------------------+
4 rows in set (0.00 sec)

The current time is as follows −

mysql> select curtime();
+-----------+
| curtime() |
+-----------+
| 18:43:55  |
+-----------+
1 row in set (0.00 sec)

Following is the query to select where the timestamp is in the current hour −

mysql> select *from DemoTable where hour(ArrivalTime)=hour(curtime());

This will produce the following output −

+---------------------+
| ArrivalTime         |
+---------------------+
| 2019-10-26 18:00:00 |
| 2019-10-26 18:55:00 |
+---------------------+
2 rows in set (0.00 sec)