Thanks to all you guys. I now have exactly what I want.

ray

>>I've got a lot of tables that I want to fill with a missing data value when the entity is NULL. I really don't want to do this one column at a time. By using the FCOUNT() function I can get the number of fields, and the FIELD() function I can get the field name. How can I use this to then test if the value of column returned by FIELD() is null, and then fill it with the appropriate missing data value?
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>IF ISNULL(EVAL(FIELD(Field #)))