A Database Error Occurred

Error Number: 1064

You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '-20, 20' at line 1

SELECT *, (total_daily_dep_flight + total_daily_arr_flight) as totalsum FROM airport_data order by totalsum DESC limit -20, 20

Filename: /usr/share/nginx/html/refundme_in/models/reports_model.php

Line Number: 416