Name
DROP TYPE
-- Removes user-defined types from the system catalogs
Synopsis
DROP TYPE typename [, ...]
|
Inputs
- typename
The name of an existing type.
Outputs
- DROP
The message returned if the command is successful.
- ERROR: RemoveType: type 'typename' does not exist
This message occurs if the specified type is not found.
Description
DROP TYPE will remove a user type from the
system catalogs. Only the owner of a type can remove it.
Notes
Refer to CREATE TYPE for
information on how to create types.
It is the user's responsibility to remove any operators,
functions, aggregates, access methods, subtypes, and tables
that use a deleted type.
However, the associated array data type
(which was automatically created by CREATE TYPE)
will be removed automatically.
 | If a built-in type is removed, the behavior of the backend
is unpredictable.
|
Usage
To remove the box type:
Compatibility
SQL99
A DROP TYPE statement exists in SQL99. As with
most other "drop" commands, DROP
TYPE in SQL99 requires a "drop behavior"
clause to select between dropping all dependent objects or refusing
to drop if dependent objects exist:
DROP TYPE name { CASCADE | RESTRICT } |
PostgreSQL currently ignores
dependencies altogether.
Note that the CREATE TYPE command and the data
type extension mechanisms in PostgreSQL
differ from SQL99.