mysql don't add value if already in column code example

Example 1: mysql insert into if not exists

INSERT INTO table_name (firstname, lastname)
SELECT 'NEW FIRSTNAME', 'NEW LASTNAME'
FROM DUAL
WHERE NOT EXISTS(
    SELECT 1
    FROM table_name
    WHERE firstname = 'NEW FIRSTNAME' AND lastname = 'NEW LASTNAME'
)
LIMIT 1;

Example 2: mysql insert if not exists

INSERT IGNORE INTO companies
    (id, full_name, address, phone_number)
VALUES
    (1, 'Apple', '1 Infinite Loop, Cupertino, California', 18002752273);

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