I am using ArcGIS Desktop 10.1.
I want to join a shapefile in which I stored geographical information with a CSV data file containing certain variables. However, when I try to apply the "join" command, the variable from the CSV file (6 digits zip code) to base the join on is not shown. Therefore I have exported the CSV file into a DBF file, but the variable still won't show up in the join command. For your information: The variable is shown as "Type:Long".
What is the solution to this problem?
I have read somewhere on the site to "Add a field" and then use the "Field Calculator" and simply copy the column in question with a Python command (!!). I tried this and copied the column, and now it shows "Type:String", but the join is still not functioning.