postgresql - PostgresQL 将一行复制到同一个表并更改一个值

Question

我想插入一个新行，从原始行复制两个字段，并将最后一个字段更改为新值。这一切都在一张 table 上完成。

请原谅表格名称/字段，它们很长。

表 1 - alert_template_allocations

• alert_template_allocation_id - pkey(忽略)
• alert_template_allocation_io_id -(副本)
• alert_template_allocation_alert_template_id -(副本)
• alert_template_allocation_user_group_id -(更改为静态值)

表2-io

• io_id - 复制属于站 222 的 io_id
• io_station_id - 只想复制站 id = 222 的行

我的尝试

insert into alert_template_allocations
(alert_template_allocation_io_id,
alert_template_allocation_alert_template_id,
alert_template_allocation_user_group_id)
values 
(
    (Select at.alert_template_allocation_io_id,
    at.alert_template_allocation_alert_template_id
    from alert_template_allocations at join io i on
    i.io_id = at.alert_template_allocation_io_id
    and i.io_station_id = 222)
, 4);

Answer 1

使用INSERT INTO SELECT语法:

INSERT INTO alert_template_allocations (alert_template_allocation_io_id,
                                        alert_template_allocation_alert_template_id,
                                        alert_template_allocation_user_group_id)
SELECT at.alert_template_allocation_io_id,
       at.alert_template_allocation_alert_template_id,
       4
FROM alert_template_allocations at 
JOIN io i 
  ON i.io_id = at.alert_template_allocation_io_id
 AND i.io_station_id = 222;