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How to Copy One Access Field to Another Automatically

John Wilson Sep 28, 2026 869 views

Question details

The user wants to know how to automatically duplicate or copy data from one field to another within Microsoft Access.

How to Automatically Copy One Field to Another in Microsoft Access

Product: Microsoft Access
Device & OS: not provided
Scenario: Data entry and database management where a value entered or stored in one source field needs to be replicated in a destination field automatically.
Observed behavior: Access does not natively duplicate field data upon entry by default, requiring specific configurations like VBA, update queries, or calculated fields to achieve this automation.

Before you start

Before duplicating fields, consider database normalization rules to ensure you are not storing unnecessary redundant data. If you only need to display the information, using a calculated control or query may be more efficient than permanently saving a duplicate value.

Solution 1Recommended

Use an Update Query to Copy Existing Field Data

Ideal for performing a one-time bulk copy of existing data from a source field to a destination field across multiple records simultaneously.

An Update Query modifies existing records in a table. By setting the destination field's value equal to the source field's value, you can quickly copy data for all records without manual entry.

Open Query Design

Open your database in Microsoft Access, navigate to the 'Create' tab on the Ribbon, and click on 'Query Design'. Select the table containing the fields you want to update and click 'Add'.

Change to Update Query

In the Query Tools Design tab, click 'Update' in the Query Type group. The query grid at the bottom will change to include an 'Update To' row.

Configure the Destination Field

Drag the destination field from your table into the query grid. In the 'Update To' row for this field, type the exact name of the source field enclosed in square brackets (e.g., [SourceFieldName]).

Run the Query

Click the 'Run' button (the red exclamation mark icon) in the Ribbon. Access will prompt you to confirm the number of rows being updated; click 'Yes' to execute the copy.

Use an Update Query to Copy Existing Field Data

Data Integrity: Always back up your database before running an Update Query, as the changes are permanent and cannot be undone via a standard undo command.

Solution 2

Use VBA on a Form for Automatic Data Entry

Best for automatically populating a destination field the exact moment a user finishes entering data into a source field on an active form.

Solution 3

Use a Calculated Control for Dynamic Display

Use this method if you only need to display the copied data on a form or report without permanently storing the duplicated data in your underlying tables.

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Frequently Asked Questions

Why is it generally bad practice to permanently copy duplicate data in Access?

In relational database design, storing the same data in multiple fields or tables violates normalization rules. It significantly increases the risk of data inconsistency (if one field is updated but the duplicate isn't) and wastes storage space. It is generally better to use queries to join tables or display the data dynamically.

Can I automatically copy data from a field to another table entirely?

Yes, you can use an Append Query to copy entire records or specific fields from one table into a new table. Alternatively, you can use VBA with SQL INSERT statements triggered by form events to push data into a different table automatically upon entry.

Does setting a 'Default Value' copy an existing field automatically?

No, the Default Value property only applies a static preset value or a system variable (like =Date()) to a newly created record. To actively copy a specific field's value from the current or previous record, you must use VBA, macros, or queries.

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