I have an attachment enabled feature class that has photos attached to points. However while any feature in the layer might have a photo, only 10-15% actually do. How can I narrow in on just those?
On the Enabling Attachments help page it says:
Consequently, you are able to use that relationship class to determine which features are present, and they will be only those with attachments.
To select your features with attachments use the instructions on the Exploring the related objects of an object in a table help page. My instructions here are paraphrased from those.
I just tested this at ArcGIS 10.2 for Desktop and it worked! I used a Standard license but you are not trying to modify a relationship class, just view using one, so a Basic license should be fine to use.
I assume the feature class has an attribute containing the path to the photo it is linked to... If that is the case, an easy way would be to use the "Select by Attribute" method or apply a filter method, where: