# DROP TYPE DROP TYPE — remove a data type ### Synopsis ``` DROP TYPE [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ] ``` ### Description `DROP TYPE` removes a user-defined data type. Only the owner of a type can remove it. ### Parameters `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, and operators), and in turn all objects that depend on those objects (see [Section 5.13](https://www.postgresql.org/docs/10/static/ddl-depend.html)). `RESTRICT` Refuse to drop the type if any objects depend on it. This is the default. ### Examples To remove the data type `box`: ``` DROP TYPE box; ``` ### Compatibility This command is similar to the corresponding command in the SQL standard, apart from the `IF EXISTS` option, which is a PostgreSQL extension. But note that much of the `CREATE TYPE` command and the data type extension mechanisms in PostgreSQL differ from the SQL standard. ### See Also [ALTER TYPE](https://www.postgresql.org/docs/10/static/sql-altertype.html), [CREATE TYPE](https://www.postgresql.org/docs/10/static/sql-createtype.html) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.postgresql.tw/reference/sql-commands/drop-type.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.