如何将导入表中的数据插入sql中的模型表？

我正在尝试将以下模型中的信息转换为代码：

我编写的代码包括创建导入表和使用“COPY”将数据插入其中。插入成功。我遇到的问题是，很长一段时间以来，我一直试图将导入表中的数据插入到模型的表中，但没有成功，同时将这些表相互关联起来。我真的不知道如何使用外键关联表，并考虑到每个关系的基数（1:1、1:N或N:M）。我已经试了好几个小时了

如果有人能键入一些关于如何进行此类插入的通用示例，我将不胜感激。 下面显示了表的创建以及数据到导入表中的副本：

drop table if exists ImportA;
create table ImportA (

    id varchar(255),
    url varchar(255),
    name varchar(255),
    description text,
    picture_url varchar(255),
    street varchar(255),
    neighbourhood varchar(255),
    city varchar(255),
    state varchar(255),
    zipcode varchar(255),
    country_code varchar(255),
    country varchar(255),
    property_type varchar(255),
    accommodates varchar(255),
    bathrooms varchar(255),
    bedrooms varchar(255),
    beds varchar(255),
    amenities text,
    square_feet varchar(255),
    price varchar(255),
    weekly_price varchar(255),
    monthly_price varchar(255),
    security_deposit varchar(255),
    cleaning_fee varchar(255),
    minimum_nights varchar(255),
    maximum_nights varchar(255)
);

drop table if exists ImportH;
create table ImportH (

    url varchar(255),
    name varchar(255),
    description text,
    picture_url varchar(255),
    host_id  varchar(255),
    host_url varchar(255),
    host_name varchar(255),
    host_since varchar(255),
    host_about text,
    host_response_time varchar(255),
    host_response_rate varchar(255),
    host_is_superhost varchar(255),
    host_picture_url varchar(255),
    host_listings_count varchar(255),
    host_verifications varchar(255),
    host_identity_verified varchar(255)
);

drop table if exists ImportR;
create table ImportR (

    id varchar(255),
    url varchar(255),
    name varchar(255),
    description text,
    picture_url varchar(255),
    street varchar(255),
    neighbourhood varchar(255),
    city varchar(255),
    date_review varchar(255),
    reviewer_id varchar(255),
    reviewer_name varchar(255),
    comments text
);

copy ImportA from 'C:\BDD\apartments.csv' csv header delimiter ',';
copy ImportH from 'C:\BDD\hosts.csv' csv header delimiter ',';
copy ImportR from 'C:\BDD\review.csv' csv header delimiter ',';

drop table if exists Country cascade;
create table Country (

    country_code varchar(255),
    country varchar(255),
    primary key (country_code)
);

drop table if exists Payment cascade;
create table Payment (

    id_payment serial,
    price varchar(255),
    weekly_price varchar(255),
    monthly_price varchar(255),
    security_deposit varchar(255),
    cleaning_fee varchar(255),
    primary key (id_payment)
);

drop table if exists Characteristic cascade;
create table Characteristic (

    id_characteristic serial,
    property_type varchar(255),
    accommodates int,
    bathrooms real,
    bedrooms int,
    beds int,
    square_feet int,
    minimum_nights int,
    maximum_nights int,
    primary key (id_characteristic)
);

drop table if exists Host cascade;
create table Host (

    host_id serial,
    host_url varchar(255),
    host_name varchar(255),
    host_since date,
    host_about text,
    host_response_time varchar(255),
    host_response_rate varchar(255),
    host_is_superhost boolean,
    host_picture_url varchar(255),
    host_listings_count int,
    host_identity_verified boolean,
    primary key (host_id)
);

drop table if exists Media cascade;
create table Media (

    id_verification serial,
    media varchar(255),
    primary key (id_verification)
);

drop table if exists Reviewer cascade;
create table Reviewer (

    id_reviewer serial,
    reviewer_name varchar(255),
    primary key (id_reviewer)
);

drop table if exists RelationHostMedia cascade;
create table RelationHostMedia (

    host_id int,
    id_verification int,
    primary key (host_id, id_verification),
    foreign key (host_id) references Host (host_id),
    foreign key (id_verification) references Media (id_verification)
);

drop table if exists Amenitie cascade;
create table Amenitie (

    id_amenitie serial,
    amenitie varchar(255),
    primary key (id_amenitie)
);

drop table if exists RelationCharacteristicAmenitie cascade;
create table RelationCharacteristicAmenitie (

    id_amenitie int,
    id_characteristic int,
    primary key (id_amenitie, id_characteristic),
    foreign key (id_amenitie) references Amenitie (id_amenitie),
    foreign key (id_characteristic) references Characteristic (id_characteristic)
);

drop table if exists Place cascade;
create table Place (

    id_place serial,
    street varchar(255),
    neighbourhood varchar(255),
    city varchar(255),
    state varchar(255),
    zipcode varchar(255),
    country_code varchar(255),
    primary key (id_place),
    foreign key (country_code) references Country (country_code)
);

drop table if exists Apartment cascade;
create table Apartment (

    id_apartment serial,
    url varchar(255),
    name varchar(255),
    description text,
    picture_url varchar(255),
    id_place int,
    id_payment int,
    id_characteristic int,
    host_id int,
    primary key (id_apartment),
    foreign key (id_place) references Place (id_place),
    foreign key (id_payment) references Payment (id_payment),
    foreign key (id_characteristic) references Characteristic (id_characteristic),
    foreign key (host_id) references Host (host_id)
);

drop table if exists Review cascade;
create table Review (

    id_review serial,
    id_reviewer int,
    id_apartment int,
    date_review date,
    comments text,
    primary key (id_review),
    foreign key (id_reviewer) references Reviewer (id_reviewer),
    foreign key (id_apartment) references Apartment (id_apartment)
);

这是我从模型中尝试的关系N:M的一个示例（没有成功）：

insert into Characteristic (property_type, accommodates, bathrooms, bedrooms, beds, square_feet, minimum_nights, maximum_nights)
select property_type, cast(accommodates as int), cast(bathrooms as real), cast(bedrooms as int), cast(beds as int), cast(square_feet as int), cast(minimum_nights as int), cast(maximum_nights as int)
from ImportA;

insert into Amenitie (amenitie)
select distinct regexp_split_to_table(amenities)
from ImportA;

insert into RelationCharacteristicAmenitie (id_amenitie, id_characteristic)
select distinct Amenitie.id_amenitie, Characteristic.id_characteristic
from Amenitie natural join Characteristic;

提前谢谢

编辑

这是我正在执行的插入：

insert into Country (country_code, country) 
select distinct country_code, country
from ImportA;

insert into Payment (price, weekly_price, monthly_price, security_deposit, cleaning_fee)
select distinct price, weekly_price, monthly_price, security_deposit, cleaning_fee
from ImportA;

insert into Characteristic (property_type, accommodates, bathrooms, bedrooms, beds, square_feet, minimum_nights, maximum_nights)
select property_type, cast(accommodates as int), cast(bathrooms as real), cast(bedrooms as int), cast(beds as int), cast(square_feet as int), cast(minimum_nights as int), cast(maximum_nights as int)
from ImportA;

insert into Amenitie (amenitie)
select distinct regexp_split_to_table(amenities)
from ImportA;

insert into RelationCharacteristicAmenitie (id_amenitie, id_characteristic)
select distinct Amenitie.id_amenitie, Characteristic.id_characteristic
from Amenitie natural join Characteristic;

insert into Host (host_url, host_name, host_since, host_about, host_response_time, host_response_rate, host_is_superhost, host_picture_url, host_listings_count, host_identity_verified)
select distinct host_url, host_name, cast(host_since as date), cast(host_about as text), host_response_time, host_response_rate, cast(host_is_superhost as boolean), host_picture_url, cast(host_listings_count as int), cast(host_identity_verified as boolean)
from ImportH;

insert into Media (media)
select distinct regexp_split_to_table(host_verifications, ',')
from ImportH;

insert into RelationHostMedia (host_id, id_verification)
select Host.host_id, Media.id_verification
from Host natural join Media;

insert into Place (street, neighbourhood, city, state, zipcode, country_code)
select distinct I.street, I.neighbourhood, I.city, I.state, I.zipcode, C.country_code
from ImportA as I, Country as C;

insert into Apartment (url, name, description, picture_url, id_place, id_payment, id_characteristic, host_id)
select distinct I.url, I.name, cast(I.description as text), I.picture_url, P.id_place, Pm.id_payment, C.id_characteristic, H.host_id
from ImportA as I, Place as P, Payment as Pm, Characteristic as C, Host as H;
select * from Apartment;

insert into Reviewer (reviewer_name)
select distinct reviewer_name
from ImportR;

insert into Review (reviewer_id, id_apartment, date_review, comments)
select distinct R.reviewer_id, A.id_apartment, cast(I.date_review as date), cast(I.comments as text)
from Reviewer as R, Apartment as A, ImportR as I;

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你的想法是对的。你能把你收到的错误贴出来吗？下面演示了一个成功的postgres插入选择，但这显然是一个非常简单的示例，因此最好是逐步解决您遇到的问题

postgres=# create table t1 ( id int );
CREATE TABLE
postgres=# create table t2 ( id int );                                          
CREATE TABLE
postgres=# insert into t1 (id) values (1), (2), (3);
INSERT 0 3
postgres=# insert into t2 (id) select id from t1;
INSERT 0 3
postgres=# select * from t2;
 id 
----
  1
  2
  3
(3 rows)

---

嗨，谢谢你的回答。我得到的结果是：注意：删除了review表上的限制«review\u id\u plantment\u fkey»，但代码末尾的“select”不会执行。我还将编辑问题并发布我所做的所有插入。现在可能可以忽略此通知，我想它是在您重新运行步骤时删除审阅表时生成的。如果没有其他错误，那么末尾的select不执行是什么意思？如果没有向目标表添加任何行，请尝试在其上运行select（不带insert），然后查看返回的数据。