Problem: Fields have blank values after joining tables
Fields return blank values in the attribute table and identify a dialog box after joining tables.
When returning data, fields from a joined dataset must be qualified properly. For example, a field named POPULATION from a joined table named TABLE1 must be specified as TABLE1.POPULATION.
In some circumstances, the joined fields are not qualified properly when the data is accessed.
Solution or Workaround
Join one table at a time instead of performing multiple joins.