CREATE FOREIGN TABLE(7) PostgreSQL 9.3.2 Documentation CREATE FOREIGN TABLE(7)NAMECREATE_FOREIGN_TABLE - define a new foreign table
SYNOPSIS
CREATE FOREIGN TABLE [ IF NOT EXISTS ] table_name ( [
column_name data_type [ OPTIONS ( option 'value' [, ... ] ) ] [ COLLATE collation ] [ column_constraint [ ... ] ]
[, ... ]
] )
SERVER server_name
[ OPTIONS ( option 'value' [, ... ] ) ]
where column_constraint is:
[ CONSTRAINT constraint_name ]
{ NOT NULL |
NULL |
DEFAULT default_expr }
DESCRIPTION
CREATE FOREIGN TABLE creates a new foreign table in the current
database. The table will be owned by the user issuing the command.
If a schema name is given (for example, CREATE FOREIGN TABLE
myschema.mytable ...) then the table is created in the specified
schema. Otherwise it is created in the current schema. The name of the
foreign table must be distinct from the name of any other foreign
table, table, sequence, index, or view in the same schema.
CREATE FOREIGN TABLE also automatically creates a data type that
represents the composite type corresponding to one row of the foreign
table. Therefore, foreign tables cannot have the same name as any
existing data type in the same schema.
To be able to create a foreign table, you must have USAGE privilege on
the foreign server, as well as USAGE privilege on all column types used
in the table.
PARAMETERS
IF NOT EXISTS
Do not throw an error if a relation with the same name already
exists. A notice is issued in this case. Note that there is no
guarantee that the existing relation is anything like the one that
would have been created.
table_name
The name (optionally schema-qualified) of the table to be created.
column_name
The name of a column to be created in the new table.
data_type
The data type of the column. This can include array specifiers. For
more information on the data types supported by PostgreSQL, refer
to Chapter 8, Data Types, in the documentation.
NOT NULL
The column is not allowed to contain null values.
NULL
The column is allowed to contain null values. This is the default.
This clause is only provided for compatibility with non-standard
SQL databases. Its use is discouraged in new applications.
DEFAULT default_expr
The DEFAULT clause assigns a default data value for the column
whose column definition it appears within. The value is any
variable-free expression (subqueries and cross-references to other
columns in the current table are not allowed). The data type of the
default expression must match the data type of the column.
The default expression will be used in any insert operation that
does not specify a value for the column. If there is no default for
a column, then the default is null.
server_name
The name of an existing foreign server to use for the foreign
table. For details on defining a server, see CREATE SERVER
(CREATE_SERVER(7)).
OPTIONS ( option 'value' [, ...] )
Options to be associated with the new foreign table or one of its
columns. The allowed option names and values are specific to each
foreign data wrapper and are validated using the foreign-data
wrapper's validator function. Duplicate option names are not
allowed (although it's OK for a table option and a column option to
have the same name).
EXAMPLES
Create foreign table films, which will be accessed through the server
film_server:
CREATE FOREIGN TABLE films (
code char(5) NOT NULL,
title varchar(40) NOT NULL,
did integer NOT NULL,
date_prod date,
kind varchar(10),
len interval hour to minute
)
SERVER film_server;
COMPATIBILITY
The CREATE FOREIGN TABLE command largely conforms to the SQL standard;
however, much as with CREATE TABLE, NULL constraints and zero-column
foreign tables are permitted. The ability to specify a default value is
also a PostgreSQL extension.
SEE ALSO
ALTER FOREIGN TABLE (ALTER_FOREIGN_TABLE(7)), DROP FOREIGN TABLE
(DROP_FOREIGN_TABLE(7)), CREATE TABLE (CREATE_TABLE(7)), CREATE SERVER
(CREATE_SERVER(7))
PostgreSQL 9.3.2 2013 CREATE FOREIGN TABLE(7)
