将 Oracle 转换为 PostgreSQL

-- Written by IntoSQL from a Oracle dump. Load it with: psql -v ON_ERROR_STOP=1 -f <file>
SET client_encoding = 'UTF8';
SET standard_conforming_strings = on;
SET check_function_bodies = false;
SET client_min_messages = warning;
SET synchronous_commit = off;
SET maintenance_work_mem = '512MB';

CREATE SEQUENCE invoice_numbers INCREMENT BY 1 MINVALUE 1 START WITH 1020;
CREATE TABLE customers (
    id bigint GENERATED BY DEFAULT AS IDENTITY NOT NULL,
    name varchar(100) NOT NULL,
    email varchar(150) NOT NULL,
    country varchar(2) DEFAULT 'US' NOT NULL,
    is_active smallint DEFAULT 1 NOT NULL,
    signed_up timestamp(0),
    created_at timestamp(0) DEFAULT LOCALTIMESTAMP NOT NULL,
    CONSTRAINT customers_check1 CHECK (is_active IN (0, 1))
);

CREATE TABLE orders (
    id bigint GENERATED BY DEFAULT AS IDENTITY NOT NULL,
    customer_id bigint NOT NULL,
    invoice bigint DEFAULT (nextval('invoice_numbers')),
    status varchar(10) DEFAULT 'pending' NOT NULL,
    total numeric(10,2) NOT NULL,
    items integer DEFAULT 1 NOT NULL,
    ordered_at timestamp(0) NOT NULL,
    shipped_at timestamp(0),
    note varchar(255),
    CONSTRAINT orders_check1 CHECK (status IN ('pending', 'paid', 'shipped', 'cancelled'))
);

COPY customers (id, name, email, country, is_active, signed_up, created_at) FROM stdin;
1	Ana Martínez	ana@example.com	MX	1	2023-01-15 00:00:00	2023-01-15 10:24:00.000000
2	Zoë Müller	zoe@example.de	DE	1	2023-02-03 00:00:00	2023-02-03 08:11:42.000000
3	José Peña	jose@example.es	ES	0	2023-03-21 00:00:00	2023-03-21 19:05:17.000000
4	李雷	lilei@example.cn	CN	1	2023-05-09 00:00:00	2023-05-09 02:40:00.000000
5	Noah O'Brien	noah@example.ie	IE	1	\N	2023-06-30 14:00:00.000000
6	Amélie Laurent	amelie@example.fr	FR	1	2024-01-02 00:00:00	2024-01-02 09:30:00.000000
7	Ravi Patel	ravi@example.in	IN	0	2024-02-29 00:00:00	2024-02-29 23:59:59.000000
8	Sofia Rossi 🌻	sofia@example.it	IT	1	2024-04-12 00:00:00	2024-04-12 12:12:12.000000
\.

COPY orders (id, customer_id, invoice, status, total, items, ordered_at, shipped_at, note) FROM stdin;
1	1	1000	shipped	129.9	3	2024-03-01 10:00:00	2024-03-02 16:30:00	\N
2	2	1001	paid	54	1	2024-03-02 11:15:00	\N	Gift wrap 🎁
3	1	1002	cancelled	12.5	1	2024-03-03 09:45:00	\N	Customer changed their mind
4	4	1003	shipped	980	12	2024-03-05 02:10:00	2024-03-07 08:00:00	请小心轻放
5	5	1004	pending	45.75	2	2024-03-08 17:20:00	\N	Leave at the door; ring twice
6	6	1005	shipped	310.4	5	2024-03-10 13:00:00	2024-03-11 09:00:00	Fragile: "glass"
7	8	1006	paid	76.2	2	2024-03-11 18:45:00	\N	\N
8	2	1007	paid	19.99	1	2024-03-12 08:00:00	\N	Paid at the counter
9	3	1008	shipped	64	2	2024-03-14 15:30:00	\N	Shipping date never recorded
10	7	1009	paid	1499	1	2024-03-15 21:05:00	\N	C:\\Users\\ravi\\invoice.pdf
\.


-- Keys, indexes and constraints, after the rows so each builds once.
CREATE UNIQUE INDEX customers_customers_pk ON customers (id);
CREATE UNIQUE INDEX customers_customers_email_uk ON customers (email);
CREATE UNIQUE INDEX orders_orders_pk ON orders (id);
CREATE INDEX orders_orders_status_date_ix ON orders (status, ordered_at);
ALTER TABLE customers ADD CONSTRAINT customers_customers_pk PRIMARY KEY USING INDEX customers_customers_pk;
ALTER TABLE customers ADD CONSTRAINT customers_customers_email_uk UNIQUE USING INDEX customers_customers_email_uk;
ALTER TABLE orders ADD CONSTRAINT orders_orders_pk PRIMARY KEY USING INDEX orders_orders_pk;
ALTER TABLE orders ADD CONSTRAINT orders_customer_fk FOREIGN KEY (customer_id) REFERENCES customers (id) NOT VALID;
DO $f$ BEGIN
    ALTER TABLE orders VALIDATE CONSTRAINT orders_customer_fk;
EXCEPTION WHEN foreign_key_violation THEN
    RAISE WARNING 'foreign key % has rows without a parent: it stays NOT VALID, and new rows are checked', 'orders_customer_fk';
END $f$;
SELECT setval(pg_get_serial_sequence('customers', 'id'), LEAST(GREATEST(COALESCE((SELECT max(id) FROM customers)::numeric, 0) + 1, 1), 9223372036854775807)::bigint, false);
COMMENT ON TABLE customers IS 'People who bought at least once';
SELECT setval(pg_get_serial_sequence('orders', 'id'), LEAST(GREATEST(COALESCE((SELECT max(id) FROM orders)::numeric, 0) + 1, 1), 9223372036854775807)::bigint, false);