How to use the BIT_LENGTH() function in SQL

CREATE TABLE Product (
    id int,
    product_name varchar(50),
    price varchar(50),
    product_id varchar (20)
);
-- Insert data
INSERT INTO Product
VALUES (101,'T-shirt','$100','oo-01-345');
INSERT INTO Product
VALUES (102,'Hand Bag','$65','oo-01-238');
INSERT INTO Product
VALUES (103,'Pen','$2','oo-01-103');
INSERT INTO Product
VALUES (104,'Cereal','$30','oo-01-775');
INSERT INTO Product
VALUES (105,'Wooden spoon','$25','oo-01-788');
INSERT INTO Product
VALUES (106,'cloth clips','$15','oo-01-924');
INSERT INTO Product
VALUES (108,'Zara Perfume','$120','oo-01-245');
-- Query 
SELECT product_id,product_name, BIT_LENGTH(product_name) AS btlen_product_name
FROM Product;