How to use Event Scheduler based on two tables? - mysql

Question

CREATE EVENT sensor_checker
ON SCHEDULE EVERY 15 MINUTE
DO
UPDATE tb_device d
inner join arduino_id a
on d.id_device = a.id_node
SET d.status_device = 0 WHERE ADDTIME(new.date_server, '900') < now()
So I have two tables tb_arduino and tb_device, I am trying to create an event that when column 'date_server' (from tb_arduino table) is less then 15 minute from current time the column 'status_device'(from tb_device) will update the value of the column 'status_device' to 0 else the column update the value to 1. But the query above doesn't seems to work.
More explanation:
If the current time is 12:20:40
'tb_arduino' table
| id_node | luminance | date_server |
| -------- | -------- | -------- |
| s01 | 270 | 2023-27-01 12:20:30 |
| s01 | 280 | 2023-27-01 12:10:30 |
| s02 | 210 | 2023-27-01 12:00:30 |
| s02 | 230 | 2023-27-01 11:55:30 |
Then the value 'status_device' of 'id_node' s02 is become 0
'tb_device' table
| id_device | status_device |
| -------- | -------- |
| s01 | 1 |
| s02 | 0 |

Answer 1

Test this:
CREATE EVENT sensor_checker
ON SCHEDULE EVERY 15 MINUTE
DO
UPDATE tb_device
SET status_device = EXISTS (
SELECT NULL
FROM arduino_id
WHERE tb_device.id_device = arduino_id.id_node
AND arduino_id.date_server >= NOW() - INTERVAL 15 MINUTE
);
Of course firstly test UPDATE query separately.