How to select <null> values

Discussion created by kindkind on Aug 8, 2012
Latest reply on Aug 13, 2012 by caroline_gis
I want to select all the values in a shapefile / field of <null>.  I have tried selecting by attributes = '<null>', it does not give an error, but it does not select anything.  This is a text field with multiple different entries so i cannot simply use the switch selection.