how to query 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: how to check if a column is null in sql

SELECT column_name FROM table_name 
WHERE column_name IS NULL;

Example 4: get null in sql

SELECT * FROM EMPLOYEES 
WHERE MANAGER_ID IS NULL ;