Syntax:
DROP TRIGGER [IF EXISTS] [schema_name.]trigger_name

This statement drops a trigger. The schema (database) name is optional.
If the schema is omitted, the trigger is dropped from the default
schema. DROP TRIGGER requires the TRIGGER privilege for the table
associated with the trigger.

Use IF EXISTS to prevent an error from occurring for a trigger that
does not exist. A NOTE is generated for a nonexistent trigger when
using IF EXISTS. See [HELP SHOW WARNINGS].

Triggers for a table are also dropped if you drop the table.

URL: https://mariadb.com/kb/en/drop-trigger/

