Presto check if NULL and return default (NVL analog)
The ISO SQL function for that is COALESCE
coalesce(my_field,0)https://prestodb.io/docs/current/functions/conditional.html
P.S. COALESCE can be used with multiple arguments. It will return the first (from the left) non-NULL argument, or NULL if not found.
e.g.
coalesce (my_field_1,my_field_2,my_field_3,my_field_4,my_field_5)