Insert multiple ENUM values in PostgreSQL

Question

Is it possible insert more than one ENUM value in a column in postgres?

e.g. In Mysql, I can do.

create table 'foo'(
    'foo_id' smallint(5) unsigned NOT NULL AUTO_INCREMENT,
    `foo_enum` enum('foo','bar','dummy') DEFAULT 'foo',
);

insert into 'foo' ('foo_id', 'foo_enum') values (1, 'foo, bar')

Answer 1

You can use CREATE TYPE to declare your enum:

CREATE TYPE tfoo AS ENUM('foo','bar','dummy');

And use an array of it to store the values:

CREATE TABLE foo (foo_id serial, foo_enum tfoo[]);

To insert:

INSERT INTO foo(foo_enum) VALUES('{foo,bar}');

Or

INSERT INTO foo(foo_enum) VALUES(ARRAY['foo','bar']::tfoo[]);

Another approach would be using another table to store the enums and a foreign key to the foo table. Example:

CREATE TABLE foo (foo_id serial primary key);
CREATE TABLE foo_enums (foo_id integer references foo(foo_id), value tfoo);

And them insert the multiple values into foo_enums:

INSERT INTO foo(foo_id) VALUES(nextval('foo_id_seq'));
INSERT INTO foo_enums(foo_id, value) VALUES
    (currval('foo_id_seq'), 'foo'),
    (currval('foo_id_seq'), 'bar');