The Field Size property determines the maximum size of information that can be stored in a text or number field. For example, if you set the size of a text field to 2, you could enter “MN” but not “Minnesota.” There are several reasons why you would want to change the size of a field:
- Changing the field size to only allow for what is necessary reduces data-entry errors.
- Access can process smaller field sizes more quickly.
- Smaller field sizes require less hard drive storage space.
While Field Size determines the maximum number of characters in a text field, in a numerical field, it determines the number type.
- In Design View, select the field whose size you want to change.
- Click the Field Size box and type or select the field size. If prompted, click Yes to complete the action.
Be very careful when changing the Field Size of a field that already contains data. Access will truncate or delete data that is larger than the new field size.
|Number Field Sizes|
|Byte||Integers from 0 to 255.||Very small – not usually a good choice.|
|Integer||Integers from -32,768 to 32,767.||Works for most numbers without decimals.|
|Long Integer||Integers from -2,147,483,648 to 2,147,483,647.||Works for most numbers without decimals.|
|Single||Positive or negative numbers up to 38 zeroes and 7 decimal places.||Good for large numbers with decimals.|
|Double||Positive or negative numbers up to 308 zeroes and 15 decimal places.||For really big numbers with decimals.|
|Replication ID||Long unique codes.||Used when you want to merge copies of a database.|
|Decimal||Positive or negative numbers up to 28 zeroes and 28 decimal places.||Good for numbers with a lot of decimals.|