What happens if you try to leave a primary key field blank?

Considering this, can a primary key be empty?

Introduction to the primary key A primary key is a column of a combination of columns in a table that uniquely identifies a row in the table. A primary key column cannot contain a NULL value or an empty string. A primary key value must be unique within the entire table.

Likewise, what is the primary key in access? A primary key is a field or set of fields with values that are unique throughout a table. Values of the key can be used to refer to entire records, because each record has a different value for the key. Access automatically manages primary keys for new tables in Access web apps and web databases.

Accordingly, how do you remove a primary key in access?

First we click the home tab and click the view tab, and then select the design view.

1. Select the roe whose the primary key remove.
2. On the Design tab, in the Tools group, click Primary Key.
3. The key indicator is removed from the field or fields that we previously specified as the primary key.

What does index or primary key Cannot contain a null value mean?

The error “Index or primary key cannot contain Null value“, occurs when you have left the primary key (index) field empty: Every table in an Access database must have a primary key, and the primary key value for each record must be unique.