Does INSERT INTO … SELECT … always match fields by ordinal position?

Question

My tests seem to confirm that

INSERT INTO a (x, y) SELECT y, x FROM b

maps b.y to a.x, i.e., the fields are matched o

Answer 1

Yes, you are correct.

The order of the fields in the INSERT INTO statement does not need to match the table definition.

But the alias/field names of the SELECT will be ignored, and the values inserted into the fields named by the INSERT INTO statement.

CREATE TABLE test (
  a      AS INT,
  b      AS INT,
  c      AS INT
)
INSERT INTO
  test (
    b,
    c,
    a
  )
SELECT
  1 AS a,
  2 AS b,
  3 AS c

SELECT * FROM test

 a | b | c
---+---+---
 3 | 1 | 2