tsql where is not null code example

Example 1: sql is not null

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

Example 2: get manager if not null in sql

SELECT FIRST_NAME , MANAGER_ID 
FROM EMPLOYEES 
WHERE MANAGER_ID IS NOT NULL ;