check null 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: nvl in sql

(NVL) replaces NULL values with same type default
value provided.
For Example = 
Select NVL(commission_percentage, 0)
From Employees;

Example 4: how to check if a column is null in sql

SELECT column_name FROM table_name 
WHERE column_name IS NULL;

Example 5: get null in sql

SELECT * FROM EMPLOYEES 
WHERE MANAGER_ID IS NULL ;

Example 6: 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;