mysql donde el valor es nulo
SELECT *
FROM contacts
WHERE last_name IS NULL;
Saf1
SELECT *
FROM contacts
WHERE last_name IS NULL;UPDATE table SET field = NULL WHERE something = somethingSELECT IFNULL(NULL, "W3Schools.com");SELECT * from TABLE where CODE IS NULL OR CODE!='C' SELECT
contactname, IFNULL(bizphone, homephone) phone
FROM
contacts;