Create and insert data with many to many relationaships - sql

Question

I try one to many relationships in postgresql, but nothing
Here my wrong attempt
CREATE TABLE person_basic_info (
id INT NOT NULL PRIMARY KEY,
gender VARCHAR (50) NULL,
first_name VARCHAR (150) NULL,
last_name VARCHAR (150) NULL,
email VARCHAR (50) NULL,
political_view_id INT NULL,
cambridge_analytica_psychographics_id INT NULL REFERENCES persons_features (id),
revolution_sympathy int NULL,
iq_level INT NULL
);
Create person features
CREATE TABLE persons_features (
id INT NOT NULL PRIMARY KEY,
dominate_feature VARCHAR (100) NULL
);
--person_basic_info
insert into person_basic_info(id, gender, first_name, last_name, email, political_view_id, cambridge_analytica_psychographics_id,revolution_sympathy,iq_level) values (1,'Female','Corenda','Garrood','cgarrood0#yellowbook.com',6,2,0,86);
insert into person_basic_info(id,gender, first_name, last_name, email, political_view_id, cambridge_analytica_psychographics_id,revolution_sympathy,iq_level) values (2,'Male','Langston','McMychem','lmcmychem1#theatlantic.com',2,4,0,111);
insert into person_basic_info(id,gender, first_name, last_name, email, political_view_id, cambridge_analytica_psychographics_id,revolution_sympathy,iq_level) values (3,'Female','Robbyn','Imison','rimison2#geocities.com',14,3,1,98);
--persons_features
insert into persons_features (id, dominate_feature) values (1,'Agreeableness');
insert into persons_features (id, dominate_feature) values (2,'Conscientiousness');
insert into persons_features (id, dominate_feature) values (3,'Extraversion');
insert into persons_features (id, dominate_feature) values (4,'Neuroticism');
insert into persons_features (id, dominate_feature) values (5,'Openness');
But nothing.
Could you help me?

Answer 1

If you execute this queries in proper order, you will get no error at all. The proper order in this case should be:
CREATE TABLE persons_features
CREATE TABLE person_basic_info
insert into persons_features
insert into person_basic_info
In this case, this isn't many to many relationship, unless person can have more than one value of cambridge_analytica_psychographics_id. If so, you should create intersection table instead of reference to persons_features table.