If null mysql

Mysql where value is null

SELECT *
FROM contacts
WHERE last_name IS NULL;

SELECT * from TABLE where CODE IS NULL OR CODE!='C'

IFNULL(MAX(EMAIL), "example@google.com") as email

SELECT IFNULL(NULL, "W3Schools.com");

 SELECT 
    contactname, IFNULL(bizphone, homephone) phone
FROM
    contacts;

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