it first checks whether there is a ride request with the input ID$.$ If there is no such

request, print a message 'Invalid request ID$\text{'}$ and stop.

$2)$ it then checks whether there is a row in driver$\_$car that matches the input driver ID and

car ID$.$

If there is no such a row, print a message 'Invalid car ID or driver ID$\text{'}$ and stop.

$3)$ if all input IDs are valid, insert a new row into the trip table, with a newly generated

trip ID$,$ input rider request ID$,$ input driver ID$,$ input car ID$,$ and start$\_$time as current

time $($systimestamp$).$ End$\_$time, fare, and rating are null.