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;