Auto. Number - Wikipedia. Auto. Number is a type of data used in Microsoft Access tables to generate an automatically incremented numeric counter. It may be used to create an identity column which uniquely identifies each record of a table. Only one Auto. Number is allowed in each table. The data type was called Counter in Access 2.

This is the size used for start+increment and random Auto. Numbers. For replication ID Auto. Numbers, the Field. Size property of the field is changed from long integer to Replication ID. The values that this property can take are .

Overview of data types and field properties in Access, and detailed data type reference.

Working with the data in Microsoft Access tables is very important and is often difficult for new users to understand how to properly design tables to store data in.

Although in many instances such an Auto. Number field will appear as if it contains the row count, it does not. Deletion of rows from a table, for example, does not cause Auto. Number fields to be re- numbered, but instead leaves . Similarly, if a transaction to add a row to a table is begun but later aborted, the Auto. Number assigned for that row will not be re- used. There are reasons to choose each form, and trade- offs in doing so.

For example, using an Auto. Number field for a customer ID might reveal information that it is desirable not to reveal to, say, customer number 6. This is one example of occasion where the start value of an Auto. Number field is raised, so that customer number 6 has, say, Auto. Number field value 1. This usage is rare, however.

If multiple users are using multiple replicas of the table, then it is likely that they will end up assigning the same values to Auto. Number fields in new rows that they add, causing replication conflicts when the replicas are merged. First, it is possible to use Replication IDs for such Auto. Numbers. Access 2. Bible. New York: Wiley Publishing, Inc. Vander Veer (2. 00. Office 2. 00. 7: The Missing Manual.

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3. AutoNumber is a type of data used in Microsoft Access tables to generate an automatically incremented numeric counter. It may be used to create an identity column.
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