Similar to questions already asked about .dbf files, I'm attempting to join .csv files to a .gdb or shapefile coverage in QGIS. The tables as added to QGIS prior to the join look fine, but after the join is complete, the amalgamated table has NULL values for all joined fields. The same happens with a variety of different tables, and regardless of whether I'm joining to a shapefile or .gdb file.
I'm running QGIS 2.0.1 on a OSX 10.8.5. The original table files are contained in .mdb format so I've purchased and used the MDB ACCDB Viewer to export them to .CSV The fact that they are fine when viewed separately leads me to believe the issue is with the join procedure, not the tables themselves.