I joined some fields to my tables and now I need a tool or something to change that field's name.
How can I do this in ModelBuilder?
I didn't find any tool to do that.
ModelBuilder – How to Rename a Field in ArcGIS Desktop
arcgis-10.0arcgis-desktoparcmapfields-attributesmodelbuilder
Related Solutions
Using python, you could setup your code to specify the input tables and fields, in addition you could specify keep all fields. Here is the syntax table to refer to that uses the join field tool, that I found here or here and a detailed explanation on a another use by GIS SE user Polygeo here
or if you wanted to you can modify your code using the add join field as here
Here is the standard approach using the join data tool in ArcMap:
Once you have selected your files and fields to base your join on, you can keep all records by keeping the default radio button on "keep all records".
Esri, provide an overview on the essentials of joining a table here.
You can see the option here to keep all records, the features that joined and not. You will have null values in the fields with no corresponding match.
Best Answer
You cannot rename fields in an attribute table. However, you can add a new field and copy the values from the old field to the new one. Finally, delete the old field if you wish. In sum: