PostgreSql INSERT FROM SELECT RETURNING ID

问题:

In PostgreSql 9.2.4 I have two tables: user (id, login, password, name) and dealer (id, user_id).

And I want to insert into both tables returning id of created dealer.

Currently I'm doing it with two queries:

WITH rows AS (
    INSERT INTO "user"
        (login, password, name)
    VALUES
        ('dealer1', 'jygbjybk', 'Dealer 1')
    RETURNING id
)
INSERT INTO dealer (user_id)
    SELECT id
    FROM rows;
SELECT currval('dealer_id_seq');

But can I implement this with a single INSERT query using RETURNING statement?

回答1:

You just need to add a RETURNING id to your INSERT ... SELECT:

WITH rows AS (...)
INSERT INTO dealer (user_id)
    SELECT id
    FROM rows
    RETURNING id;

Demo: http://sqlfiddle.com/#!12/75008/1