- IF EXISTS
Do not throw an error if the rule does not exist. A notice is issued in this case.
The name of the rule to drop.
The name (optionally schema-qualified) of the table or view that the rule applies to.
Automatically drop objects that depend on the rule, and in turn all objects that depend on those objects (see Section 5.13).
Refuse to drop the rule if any objects depend on it. This is the default.