| Data Type | Description | Decimal precision | Storage size |
|---|---|---|---|
| Byte | Numbers from 0 to 255 (no fractions). Use Number | Byte in preference to Yes/No (True=-1, False=0) | None | 1 byte |
| Decimal | Numbers from -10^28-1 through 10^28-1 (.mdb) | 28 | 12bytes |
| Integer | Numbers from -32,768 to 32,767 (no fractions). | None | 2 bytes |
| Long Integer | (Default) Numbers from -2,147,483,648 to 2,147,483,647 (no fractions). | None | 4 bytes |
| Single | Numbers from -3.402823E38 to -1.401298E-45 for negative values and from 1.401298E-45 to 3.402823E38 for positive values. | 7 | 4 bytes |
| Double | Numbers from -1.79769313486231E308 to -4.94065645841247E–324 for negative values and from 4.94065645841247E-324 to 1.79769313486231E308 for positive values. | 15 | 8 bytes |
| Replication ID | Globally unique identifier (GUID) | N/A | 16 bytes |
SQL Server
If an Access database is upsized to SQL Server, Yes/No fields (tickboxes) will be converted to bit fields. These will give an error in Access if any row contains a NULL: This record has been changed by another user since you started editing it. If you save the record, you will overwrite the changes the other user made.
To resolve this, assign a default value of (0) on all bit fields and update any existing rows to either 0 or 1.
Compatibility Between the 32-bit and 64-bit Versions of Office 2016 - Microsoft.