IFNULL
IFNULL("- Opportunity Custom Attributes".PICK_22, 'null') where "- Opportunity Custom Attributes".PICK_22 is column name.
When I validated results, I saw the records that meet above criterion did not get a "null" value, they are just blank. In my chart, they show up as separate bar and I don't know how to put axis label and legend.
Also, is IFNULL meant to be an alternative to creating combined analyses? Do you get same results? If no, when is it advisable to use it? Thanks.