sql - PostgreSQL。在联结表中插入值

Question

美好的一天。我在连接表中插入数据时遇到了一些问题。

这是我的表格:

users table

    -----------------------
    |user_id   |FullName |
    -----------------------
    |1      | John    |
    |2      | Michael |
    |3      | Bryce   |

addresses table

    -----------------------------------------
    |address_id|    country    |    city     |
    -----------------------------------------
    |    1     |      USA      |    New-York |
    |    2     |     Russia    |    Moscow   |
    |    3     |    Germany    |    Berlin   |
    |    4     |      UK       |    London   |

This is the Junction table to connect the 
    two now.

"user_address"

    ------------------------
    | user_id | address_id |
    ------------------------
    |   1     |      1     |
    |   1     |      2     |
    |   2     |      3     |
    |   3     |      1     |

我想连接它们然后创建地址。所以，我需要在 address table 和它们中创建一个新地址，将创建地址的 ID 放在 junction 中(不关心 user_id，我只需要处理 address_id).

这是我用于创建地址的查询:

"INSERT INTO addresses (country, city) VALUES (?, ?) RETURNING id, country, city"

如您所见，我需要返回创建的地址的值以将它们显示给我的消费者。

我怎样才能插入一个新地址，获取它的 ID 并将其放入我的路口？在单个查询中是理想的。

Answer 1

with 子句插入会有所帮助。

with ins AS
(
 INSERT INTO addresses (country, city) 
     VALUES ('USA', 'New-York') RETURNING address_id, country, city
),
ins2 AS
(
 INSERT INTO user_address (address_id) select address_id from ins
)
select * from ins

注意:

你说

.. don't care about user_id, I just need to handle address_id

所以，我假设您有另一种机制来更新 user_ids

DEMO