Filtering records on empty values can be a real pain as there are many mistakes to make.
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First of all I would like to have a look at the null function. Many times, I’ve seen people ask the question why their null values haven’t been working. Below 3 examples. Only one will really work.
You can type the text null (this is just 4 characters, n,u,l,l)
And then you can have empty strings (i.e. don’t fill in anything)
Now how would we use the filter rows option to get just the records where a specified field is empty? You might want to try this:
Well the null function isn’t going to work like that! The above query will be evaluated as accountnumber eq
The eq operator has to have something on the right.
Also if you replaced the above with accountnumber eq ” you would only get the empty string values. which isn’t exactly the same as nothing. Huh???
When a field is not set Dataverse will not return that field at all and nothing is not the same as an empty string.
So how do we make this work?
Now we can make use of FetchXml to filter by null values.
So for example if I wanted to find the accounts without an account number set I could use the following query:
Then there is a second option to filter by null values (Thanks Marcel, see comments below)
accountnumber eq null
So by not typing the expression but the text null without quotes will also work.
And in a similar way I could also find all the records that do have an account number set:
All that is needed to filter your records are the null and not-null operators.
<fetch mapping='logical'> <entity name='account'> <attribute name='accountid'/> <attribute name='name'/> <attribute name='accountnumber'/> <filter> <condition attribute='accountnumber' operator='not-null'/> </filter> </entity> </fetch>
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