PostgreSQL nested INSERTs / WITHs for foreign key insertions

by

Don’t nest the common table expressions, just write one after the other:

WITH Y AS (
  INSERT INTO A (foo)
  VALUES ('abc')
  RETURNING id
), X as (
  INSERT INTO B (a_id, bar)
  SELECT id, 'def'
  FROM Y
  RETURNING id
)
INSERT INTO C (b_id, baz)
SELECT id, 'ghi'
FROM X;

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