mysql donde el valor es nulo
SELECT *
FROM contacts
WHERE last_name IS NULL;
Saf1
SELECT *
FROM contacts
WHERE last_name IS NULL;
SELECT IFNULL(NULL, "W3Schools.com");
IFNULL(MAX(EMAIL), "[email protected]") as email
SELECT * from TABLE where CODE IS NULL OR CODE!='C'
SELECT
contactname, IFNULL(bizphone, homephone) phone
FROM
contacts;