How do I filter by NULL values in a report?
Oracle Service Cloud, All versions
A filter cannot be set to include or exclude null values.
A report can only use an "is null" or an "is not null" filter if the filter is not selectable at run time.
To adjust this setting while viewing a filter in the Reports Designer, deselect the "Make this filter selectable at run time" option. This will add both null filter options to the Operator dropdown menu.
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See Answer ID 1744: Values of the Operator field when configuring report filters for additional details.