The value of two date types is subtracted and converted to seconds

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From the official blog of Sunda Technology

​ ​http://www.cnsendblog.com/index.php/?p=2200​​

The values of two date types are subtracted , Get the exact value of days , multiply 24 Into hours , Multiplied by 60 Turn into minutes , Multiplied by 60 Turn into seconds

SELECT
receive_time,gps_time,receive_time-gps_time,(receive_time-gps_time)*24*60*60

FROM GPS_TRACK_INFO

where track_id=1844604435 and vehicle_id=29732;