select where not null code example
Example 1: sql not null
SELECT column_name FROM table_name
WHERE column_name IS NOT NULL;
Example 2: how to check if a column is null in sql
SELECT column_name FROM table_name
WHERE column_name IS NULL;
SELECT column_name FROM table_name
WHERE column_name IS NOT NULL;
SELECT column_name FROM table_name
WHERE column_name IS NULL;