What are the rules about what tables/views can be referenced from the
RETURNING clause of an INSERT?
I am particularly puzzled by the following. Given these definitions:
CREATE TABLE test (id serial primary key, name varchar);
CREATE VIEW tv AS SELECT * FROM test;
CREATE RULE _update AS ON UPDATE TO tv DO INSTEAD
UPDATE test SET name = NEW.name WHERE id = OLD.id RETURNING NEW.*;
But this does not:
CREATE RULE _insert AS ON INSERT TO tv DO INSTEAD
INSERT INTO test (name) VALUES (NEW.name) RETURNING NEW.*;
ERROR: invalid reference to FROM-clause entry for table "*NEW*"
LINE 2: INSERT INTO test (name) VALUES (NEW.name) RETURNING NEW.*;
HINT: There is an entry for table "*NEW*", but it cannot be
referenced from this part of the query.
Why is there a difference?
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