SQL

get null in sql

SELECT * FROM EMPLOYEES 
WHERE MANAGER_ID IS NULL ; 

sql is null

Tests for empty (NULL) values.
Example: Returns users that haven’t given a contact number.
SELECT * FROM users
WHERE contact_number IS NULL;

SQL IS NULL and IS NOT NULL

SELECT *
FROM Employee
WHERE email IS NULL;

SQL IS NULL

SELECT *
FROM Employee
WHERE email IS NOT NULL;