how to select null values in sql code example

Example 1: get null value in sql

SELECT * FROM my_table WHERE col1 IS NULL;

Example 2: sql not null

SELECT column_name FROM table_name 
WHERE column_name IS NOT NULL;

Example 3: Select without null values sql

SELECT column_names
FROM table_name
WHERE column_name IS NOT NULL;

Example 4: 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;

Example 5: get null in sql

SELECT * FROM EMPLOYEES 
WHERE MANAGER_ID IS NULL ;