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How to Fix Access ODBC Decimal Field Precision Errors

Camila Milosovich Oct 10, 2026 869 views

Question details

The user needs to resolve an error where Microsoft Access reports that a decimal field's precision is too small during an ODBC data update.

How to Fix Access ODBC Decimal Field Precision Errors

Product: Microsoft Access
Device & OS: not provided
Scenario: Updating data in a target database table using an ODBC connection.
Observed behavior: Microsoft Access blocks the update operation and displays an error indicating that the decimal field's precision is too small, even for operations that worked previously.

Before you start

Ensure you have administrator access to both the source database and the target Microsoft Access database so you can view and modify table design properties.

Solution 1Recommended

Verify and Align Source and Target Field Definitions

Check the data types, precision, and scale in both the source and target databases to ensure they match perfectly.

Precision errors generally occur when the target field in Access is configured with a smaller total digit capacity (Precision) or decimal capacity (Scale) than the incoming data.

Open target table design

Launch Microsoft Access, right-click the target table receiving the update, and select 'Design View'.

Check decimal properties

Click on the decimal field in question. In the Field Properties pane at the bottom, note the values for 'Data Type', 'Precision', and 'Scale'.

Compare with source

Check the corresponding source field definition in your SQL or external database to identify any discrepancies.

Update Access properties

Increase the Precision and Scale in the Access Field Properties so they are equal to or greater than the source field's configuration, then save the table.

Verify and Align Source and Target Field Definitions

Testing Changes: Test the connection with a simple insert involving only one row of manually typed data before running complex batch updates.

Solution 2

Convert Source Data Types in the Update Query

Use data conversion functions to force the source values to match the target field's accepted format before the update occurs.

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Frequently Asked Questions

Why does my ODBC update fail in Access even when no numeric data is changed?

If table schemas are not perfectly synced via the ODBC driver, Access may proactively block updates to any field if it detects a mismatch in the table's overall precision settings, even if that specific data isn't being altered.

How do I check the precision and scale of a decimal field in Access?

Open your table in Design View, select the decimal field, and look at the Field Properties pane at the bottom. You will see specific rows clearly labeled for 'Precision' and 'Scale'.

What is the exact difference between precision and scale?

Precision refers to the total number of digits a field can store (both to the left and right of the decimal point). Scale refers specifically to the maximum number of digits allowed to the right of the decimal point.

Can I bypass this precision error by linking tables instead of importing?

Linking tables via ODBC ensures you are using the live schema from the source database, which can sometimes bypass local Access precision limitations. However, strict driver configurations may still require matching settings.

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