postgresql: relation “table_name” does not exist when trying to CREATE TABLE

I am running this code thru pgAdmin4:

CREATE TABLE product(
    code integer, 
    pname varchar(30),
    descr varchar(50),
    utype varchar(30),
    uprice float, 
    manu varchar(30),
    sid integer,
    PRIMARY KEY (code, sid),
    FOREIGN KEY (sid) REFERENCES supplier(sid)
);

CREATE TABLE branch(
    bid integer,
    bname varchar(30),
    baddress varchar(50),
    PRIMARY KEY (bid)
);

CREATE TABLE stock(
    code integer,
    bid integer,
    units float,
    PRIMARY KEY (code, bid)
);

CREATE TABLE receipt(
    bid integer,
    rdate date,
    rtime time,
    ptype varchar(30),
    total float,
    PRIMARY KEY (bid, rdate, rtime)
);

CREATE TABLE purchase(
    bid integer,
    rdate date,
    rtime time,
    code integer,
    units float,
    PRIMARY KEY (bid, rdate, rtime, code),
    check (units > 0)
);

CREATE TABLE supplier(
    sid integer,
    sname varchar(30),
    address varchar(50),
    phone numeric (9,0),
    PRIMARY KEY (sid)
);

INSERT INTO product (code, pname, descr, utype, uprice, manu, sid) VALUES
        (987, 'Tomatoes',       'Vegetable',  'Kg',  5.99,  'manufacturer1', 111),
        (876, 'Cucumbers',      'Vegetable',  'Kg',  4.99,  'manufacturer1', 222),
        (765, 'Cornflakes',     'Cornflakes', 'Box', 15.9,  'manufacturer1', 222),

INSERT INTO branch (bid, bname, baddress) VALUES
        (987, 'tal aviv', 'road 1 tel aviv'),
        (878, 'Raanana',  'road 1 raanana'),
        (767, 'Holon',    'road 1 holon');

INSERT INTO stock (code, bid, units) VALUES
        (987, 989, 50),
        (987, 878, 75),
        (987, 767, 100),

INSERT INTO receipt (bid, rdate, rtime, ptype) VALUES
        (989, '2020-3-19', '10:00', 'Cash'),
        (989, '2020-7-16', '12:30', 'Credit'),
        (989, '2020-7-15', '15:35', 'Credit'),

INSERT INTO purchase (bid, rdate, rtime, code, units) VALUES
        (989, '2020-3-18', '10:00', 987, 5),
        (989, '2020-3-18', '10:00', 876, 3),
        (989, '2020-3-18', '10:00', 543, 4),

INSERT INTO supplier (sid, sname, address, phone) VALUES
        (111, 'supplier2', 'road2 tel aviv',  111111111),
        (222, 'supplier3', 'road3 jerusalem', 222222222),
        (333, 'supplier4', 'road2 eilat',     333333333);

i am keep getting this message: ERROR: relation “supplier” does not exist SQL state: 42P01

The problem is with the foreign key in the product table (1st table), i know this because i removed it and it created all the tables with values (i removed some of the values to facilitate the writing).

Not sure if its a syntax error, i tried a couple of ways to solve it but i am clueless, any suggestions? Thanks in advance.

Answer

You have to create supplier table before product table as sid from product table references to sid in supplier table as a foreign key.

Here is the working demo.

CREATE TABLE supplier(
    sid integer,
    sname varchar(30),
    address varchar(50),
    phone numeric (9,0),
    PRIMARY KEY (sid)
);

CREATE TABLE product(
    code integer, 
    pname varchar(30),
    descr varchar(50),
    utype varchar(30),
    uprice float, 
    manu varchar(30),
    sid integer,
    PRIMARY KEY (code, sid),
    FOREIGN KEY (sid) REFERENCES supplier(sid)
);

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Answer