DROP TYPE — remove a data type
DROP TYPE [ IF EXISTS ] name
[, ...] [ CASCADE | RESTRICT ]
IF EXISTS
Do not throw an error if the type does not exist. A notice is issued in this case.
name
The name (optionally schema-qualified) of the data type to remove.
CASCADE
Automatically drop objects that depend on the type (such as table columns, functions, operators).
RESTRICT
Refuse to drop the type if any objects depend on it. This is the default.