How does null work in SQL?

In SQL, NULL is a special field used to indicate that a data value does not exist in the database. However, a NULL value is different from a zero value; it indicates a field that contains spaces.

How does null work in SQL?

In SQL, we use two syntax to identify NULL values; use the IS NULL and IS NOT NULL operators instead. For a clearer understanding, refer to the query syntax:

IS NULL Syntax

SELECT column_name,...

FROM table_name

WHERE column_name IS NULL;

IS NOT NULL Syntax

SELECT column_name,...

FROM table_name

WHERE column_name IS NOT NULL;