Inner Join, PostgreSQL

Inner Join

--PostgreSQL 9.6
--'\\' is a delimiter

--create two tables and insert records
--upc datatype is text not numeric because of the dash
--adjust column width using numbers beside the datatype

CREATE TABLE product( 
    product_id INT PRIMARY KEY NOT NULL, 
    sku CHAR(10) NOT NULL, 
    category VARCHAR(50) NOT NULL, 
    date TIMESTAMP, 
    price DECIMAL (10,2)
);

INSERT INTO product
(product_id, sku, category,date, price)VALUES 
(101, 'A113M1','Mascara', '2020-04-23', 23),(102,'A212M2', 'Mascara', '2020-02-12', 23),(103,'A221NP2','Nail Polish', '2020-03-07', 15), 
(104, 'A332NP2','Nail Polish', '2020-05-21', 15),
(105, 'A36LIPG','Lipgloss', '2020-07-15', 19);

CREATE TABLE warehouse( 
    sku CHAR(10) PRIMARY KEY NOT NULL, 
    upc VARCHAR (30) NOT NULL, 
    quantity INT NOT NULL 
);

INSERT INTO warehouse
(sku, upc, quantity) VALUES
('A113M1', '3445-113-545', 540),
('A212M2',	'3445-212-454', 230),
('A221NP2',	'3445-221-432', 670),
('A332NP2',	'3445-332-003', 168),
('A36LIPG',	'3445-336-347', 470);

--run query Inner Join

SELECT product.sku, warehouse.upc, warehouse.quantity
FROM product
INNER JOIN warehouse ON product.sku= warehouse.sku;


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