SELECT 'CREATE DATABASE main'
WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'main')\gexec

CREATE TABLE categories
(
    name text COLLATE pg_catalog."default",
    id integer NOT NULL GENERATED ALWAYS AS IDENTITY ( INCREMENT 1 START 1 MINVALUE 1 MAXVALUE 2147483647 CACHE 1 ),
    CONSTRAINT categories_pkey PRIMARY KEY (id)
);

CREATE TABLE customers
(
    id integer NOT NULL GENERATED ALWAYS AS IDENTITY ( INCREMENT 1 START 1 MINVALUE 1 MAXVALUE 2147483647 CACHE 1 ),
    name text COLLATE pg_catalog."default",
    email text COLLATE pg_catalog."default",
    age integer,
    "dateOfBirth" date,
    CONSTRAINT customers_pkey PRIMARY KEY (id)
);

CREATE TABLE customer_category
(
    customer_id integer,
    category_id integer,
    notes text COLLATE pg_catalog."default",
    id integer NOT NULL GENERATED ALWAYS AS IDENTITY ( INCREMENT 1 START 1 MINVALUE 1 MAXVALUE 2147483647 CACHE 1 ),
    CONSTRAINT "Category" FOREIGN KEY (category_id)
        REFERENCES public.categories (id) MATCH SIMPLE
        ON UPDATE NO ACTION
        ON DELETE NO ACTION
        NOT VALID,
    CONSTRAINT "Customer" FOREIGN KEY (customer_id)
        REFERENCES public.customers (id) MATCH SIMPLE
        ON UPDATE NO ACTION
        ON DELETE NO ACTION
        NOT VALID
);


INSERT INTO customers (name, email, age) VALUES ('Mike', 'mike@mike.com', 30);
INSERT INTO categories (name) VALUES ('Books');