>>Hi Frank:
>>
>>Your SQL is erroneous, because ISNULL() only accepts 1 parameters and returns True/False, so in this case Thierry was right in using NVL(), but at the cost of always replacing the value (with the actual one or the new one, whatever)
>>
>>But if you are processing to much data and want the best performance, then Dragan's suggestion of building your UPDATE (with a series of IF..ENDIF for each field) is the best performing and does not add any noticeable cost of maintenance.
>
>
>Used database is SQL Server so ISNULL() have the right syntax.
>In TSQL ISNULL() function is equal to VFP NVL() function.

Thanks Borislav! Didn't see that SQL-Server was the database! :-)