I’m trying to join a .dbf which contains no spatial data to a shapefile containing spatial data. Ideally I’d like to create an attribute index on the join field in the .dbf before I join it to the shapefile.
Does anybody know how I can do this?
Also in the join menu there are two tick box options:
- Cache join layer in virtual memory
- Create attribute index on join field
Can anybody tell me what these two options mean? Is the attribute index created during the join if I was to tick this or is it done before the join?
I'm using QGIS 2.0.1 on Windows 7.