is null in mysql code example

Example 1: mysql where value is null

SELECT *
FROM contacts
WHERE last_name IS NULL;

Example 2: mysql select default if null

IFNULL(MAX(EMAIL), "[email protected]") as email

Example 3: mysql set value as null

UPDATE table SET field = NULL WHERE something = something

Example 4: check if value is null mysql

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

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