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Build A Salon Appointment Scheduler - Backend Development - The

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Hello, I’m stuck. Help. Don’t know what is wrong. Help. So I’m trying to check if the user inputs a valid service_id. This part is not working: SERVICE_ID_EXISTS=$($PSQL "SELECT name FROM services WHERE service_id = $SERVICE_ID_CHOSEN") if [[ -z $SERVICE_ID_EXISTS ]] then MAIN_MENU "No service with the number: $SERVICE_ID_CHOSEN" else echo "test print --> $SERVICE_ID_EXISTS" fi I want to check if the user types a number that corresponds to a service and if a
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