How to test feature class for existence of records in a 2nd feature class

Discussion created by agisguy on May 13, 2014
Latest reply on May 13, 2014 by GSCUser85
I think this should have been easy, but I have spent all day racking my brains...

I have 2 feature classes (points). One comes in daily let's say. The other is a accumulation of all the dailies that come in.

I want to test if the daily FC has any records that are already present in the cumulative FC, and ignore those when appending or copying into the cumulative FC.

I have tried nesting cursors but that doesn't seem to work.... they both have a unique ID field, but at some stage I will want to add another condition that the ID and operator fields must be unique combined (the same ID can have more than one operator).

I am so lost.... any help appreciated.