在为 returning 插入数据期间，子查询必须 return 只有一列

Question

在 INSERT INTO 期间 return 加入列有什么方法吗？这是我的查询

insert into contacts(address,building_type, building_number, user_id, province_id, city_id, district_id, village_id)
VALUES ('address one', 'apartement', 12, 1, 1 , 1, 1, 1)
RETURNING address, building_type, building_number,
    (select p.name as province from provinces as p where p.id = contacts.province_id),
    (select c.name  as city from cities as c where c.id = contacts.city_id),
    (select d.name as district from districts as d where d.id = contacts.district_id),
    (select v.name as village, v.postal from villages as v where v.id = contacts.village_id);

最后一个子查询不起作用，因为我想要 return 村庄 table 有两列有什么方法可以传递那 2 列吗？？

Answer 1

您可以将 CTE 与 returning 一起使用。 . .然后查询：

with i as (
      insert into contacts(address,building_type, building_number, user_id, province_id, city_id, district_id, village_id)
      values ('address one', 'apartement', 12, 1, 1 , 1, 1, 1)
      returning address, rt, rw, building_type, building_number, province_id, city_id, district_id, village_id)
select i.*,
       (select p.name as province from provinces as p where p.id = i.province_id),
       (select c.name  as city from cities as c where c.id = i.city_id),
       (select d.name as district from districts as d where d.id = i.district_id),
       (select v.name as village, v.postal from villages as v where v.id = i.village_id)    
from i;

但是，上面返回的是村庄的多行。可能最好的解决方法是使用适当的 joins:

with i as (
      insert into contacts(address,building_type, building_number, user_id, province_id, city_id, district_id, village_id)
      values ('address one', 'apartement', 12, 1, 1 , 1, 1, 1)
      returning address, rt, rw, building_type, building_number, province_id, city_id, district_id, village_id)
select i.*, p.name as province, c.name as city, d.name as district,
       v.name as village, v.postal   
from i left join
     province p
     on p.id = i.province_id left join
     cities c 
     on c.id = i.city_id left join
     districts d 
     on d.id = i.district_id left join
     villages v 
     on v.id = i.village_id

在为 returning 插入数据期间，子查询必须 return 只有一列

subquery must return only one column during insert data for returning

sql

postgresql

subquery

sql-insert

psql