How to configure a field in Oracle to allow null values?

In Oracle, you can set a field to be nullable in two ways:

1. When creating a table, use the NULL keyword to declare a field as allowing for null values. For example, when creating a table named “table_name” with a field named “column_name” that can be empty, you can use the following statement:
2. Make a table called “table_name” with a column named “column_name” that can have NULL values.
3. In the statement above, the term datatype refers to the data type of a specified field, and the NULL keyword indicates that the field is allowed to be empty.
4. To modify the properties of a field in an existing table to allow it to be nullable, you can use the ALTER TABLE statement. For example, to allow the column_name field in a table named table_name to be nullable, you can use the following statement:
5. Change the table named “table_name” by allowing the column named “column_name” to have NULL values.
6. In the above statement, the MODIFY keyword is used to change the attributes of a field, while the NULL keyword indicates that the field is allowed to be empty.

Whether when creating a table or modifying field properties, using the NULL keyword allows the field to be set as nullable.