>>>Looks like IsBlank() does not work for numeric and logical fields. Am I missing something?
>>>
>>>

>>>CLEAR
>>>CLOSE TABLES all
>>>
>>>create TABLE c:\junk (fldBlob W, fldChar c(10), flddate D, flddt T, ;
>>>	fldg G, fldlogic L NULL,;
>>>	fldM M, fldN N(6,1) NULL,fldfloat F(6,1) NULL, fldVar Q)
>>>
>>>APPEND blank
>>>
>>>COUNT FOR ISBLANK(fldLogic) OR ISBLANK(fldN) TO ln
>>>?ln   && 1
>>>SELECT * FROM c:\junk WHERE ISBLANK(fldLogic) OR ISBLANK(fldN) INTO CURSOR tmpcurs1
>>>?_tally   && 0
>>>sele;
>>>	fldLogic, ISBLANK(fldLogic) _fldLogic, isb(fldLogic) _fldLogic1,;
>>>	fldN, ISBLANK(fldN) _fldN, ISB(fldN) _fldN1,;
>>>	fldFloat, ISBLANK(fldfloat) _fldFloat, ISB(fldfloat) _fldFloat1;
>>>	from c:\junk;
>>>	into curs tmpcrs2
>>>
>>>?ISBLANK(fldLogic), _fldLogic
>>>?ISBLANK(fldN), _fldN
>>>?ISBLANK(fldfloat), _fldFloat
>>>
>>>
>>>*---------------------------
>>>PROCEDURE isb
>>>LPARAMETERS pField
>>>RETURN ISBLANK(pField)
>>>
>>>

>>
>>a bug
>
>Do you know, whether it is documented anywhere?

I don't think so, but I remember discussions on this in the past:

Re: How do you see of a field if EMPTY. Thread #434009 Message #434081