mysql, где значение ноль
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), "example@google.com") as emailSELECT * from TABLE where CODE IS NULL OR CODE!='C' SELECT
contactname, IFNULL(bizphone, homephone) phone
FROM
contacts;