I'm trying to use SQL to select uniquely duplicative service dates, all records of which are contained within a single table. Here's a sample starting table:

I've figured out how to find 2 different records that have the same date and get them in one row, but I end up with a somewhat duplicated table, as it's comparing each record to all others:

I don't want the last row, as it's essentially a duplicate of the first.

Any ideas for how to get rid of that second row?

Here's some replication code (and here's my SQL Fiddle: