I need to populate a new table in a second schema from an existing one, but having problems casting the "schema1.a.disclosure_level" column enum to the "schema2.b.disclosure_level" enum. A cast via::text or:: varchar did not help. Casting to::schema1.a.disclosure_level raises a cross-database reference error.
INSERT INTO schema1.a (id, disclosure_level)
SELECT schema2.b.id, schema2.b.disclosure_level
FROM schema2.b;
Any ideas?
@Bergi showed me the solution.
INSERT INTO schema1.a (id, disclosure_level)
SELECT schema2.b.id, schema2.b.disclosure_level::text:schema1.disclosure_level_enum
FROM schema2.b;
where my fault was to use the column name instead of the enum type definition in the cast: schema1.disclosure_level_enum
(type) instead of schema1.a.disclosure_level
(column)!
It can be possible if you cast to VARCHAR as first and second to another enum
"valueType" = NEW."valueType"::VARCHAR::"enum_second"
From here:
https://www.postgresql.org/docs/current/datatype-enum.html
8.7.3. Type Safety
Each enumerated data type is separate and cannot be compared with other enumerated types.
Example:
CREATE TYPE animal AS ENUM ('dog', 'cat', 'rabbit');
CREATE TYPE animal_2 AS ENUM ('dog', 'cat', 'rabbit');
create table enum_test(id integer, a animal, a2 animal_2);
insert into enum_test values (1, 'dog', 'cat');
select a::animal from enum_test ;
a
-----
dog
select a::animal_2 from enum_test ;
ERROR: cannot cast type animal to animal_2
LINE 1: select a::animal_2 from enum_test ;
So the answer is no you can't cast one enum to another.
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