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Difficulty with NULLASVALUE
Hi all,
I'm new to Qlik. I've generally been able to answer questions via previous discussions (thanks to everyone who contributes). Unfortunately, I have not been able to figure out an issue I'm having with NULLASVALUE using previously answered questions in the community forums.
Need: my need is to be able to select null values in a sheet table which I will then export. I'm pulling from several QVD loaded tables.
Problem: I've included 'set NULLASVALUE='<NULL>';' in each applicable sheet of a load script and also tried placing the statement in a sheet of other set statements (although I did these at different times) at the beginning of the load. The example code below includes a "where 1=1" statement that was recommended in another community post because of issues with optimized QVDs. I've tried loading with and without this statement.
I'm having issues with the '<NULL>' sometimes being written and available, other times getting blanks, and other times getting a "-" for the null value as is default.
Any suggestions would be most welcome.
****************************
GIFTUDFtemp:
NullAsValue*;
LOAD
"Gift ID",
[Gift Alt Group Code],
[Gift Mission Flag]
FROM [QVD]
(qvd)
where 1=1;
****************************
I've replaced the QVD just to ensure I'm compliant with organizational privacy policies.
Thank you,
Brian
Accepted Solutions

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Hi Brian,
as Sunny wrote
set NULLASVALUE='<NULL>';
SET NullValue = '<Null>';
However try like
If(Len(Trim([Gift ID])) = 0,'<Null>',[Gift ID]) as [Gift ID],
etc.
Regards,
Antonio

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Have you specified what the value needs to be?
NullAsValue *;
Set NullValue = 'NULL';
GIFTUDFtemp:
LOAD
"Gift ID",
[Gift Alt Group Code],
[Gift Mission Flag]
FROM [QVD]
(qvd)
where 1=1;

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Hi Sunny,
Yes. Sorry I had a bad copy/paste. I have 'set NULLASVALUE='<NULL>';' in a group of set statements in the first load sheet I have. I've also tried placing it this in each load sheet as follows:
GIFTUDFtemp:
set NULLASVALUE='<NULL>';
NullAsValue*;
LOAD
"Gift ID",
[Gift Alt Group Code],
[Gift Mission Flag]
FROM [lib://QVD - Donor Perfect/DonorPerfect.GiftUDF.QVD]
(qvd)
where 1=1;
Thanks,
Brian

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Difficult to say unless we can see it or test it out

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Hi Brian,
as Sunny wrote
set NULLASVALUE='<NULL>';
SET NullValue = '<Null>';
However try like
If(Len(Trim([Gift ID])) = 0,'<Null>',[Gift ID]) as [Gift ID],
etc.
Regards,
Antonio


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According to Help...
You need 2 lines, assuming you are replacing null GiftID's
NullAsValue GiftID;
Set NullValue='<Null>';
Personally, I go about it by setting a flag and using that to select.
LOAD *,
If(IsNull(GiftID),1,0) As NullGiftID;

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Thank you, Antonio. The second solution worked for me. I still could not get the NullAsValue or NullValue options to work. I was using both lines cited multiple times in this thread. A flag of just null wasn't appropriate in this case because I wanted to select both null and other values for the field.
I did figure out that I can filter on the <null> in the table itself but not when I used a filter pane. In the filter pane no option for "<null>" appeared after using the length/trim statement.
Thank you to everyone who offered help.


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Hi Brian,
I was just having the same experience -- NullAsValue seeming to not work. I am now fairly certain that it's because my measure is counting an ID that is loaded from other sources, so I have IDs that have no related values in the dimension that has the annoying nulls.
Are you doing the following LOAD in a subsequent load statement? I suspect that would in effect "clean up" the nulls that weren't caught in the initial load.
LOAD *,
If(IsNull(GiftID),1,0) As NullGiftID;
