Display Available User Defined Types in Oracle

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I want to get all the user defined type I have defined so far. Please tell me how to display it? And I want to know how to drop a UDT?

drop type <type name?

Is this correct?

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Query dba_types, all_types, or user_types depending on what privileges you have and what types you are looking for. user_types will list the types that are owned by the current user. all_types will list all the types that the current user has access to which will include types owned by other users that the current user has been granted privileges on. dba_types will list all the types in the database but you would need privileges to be able to query the dba_* views such as the select any dictionary privilege or the select_catalog_role role.