How do you find the number of unique values when they span multiple columns. In my case, I am trying to get a count of the number of times each latitude/longitude occurs.
For example
+------------+
| Lat Long |
+------------+
| 39.3 -76.6 |
| 39.3 -76.6 |
| 39.3 -76.6 |
| 39.9 -76.1 |
+------------+
Would output
+---------------+
| Lat Long Freq |
+---------------+
| 39.3 -76.6 3 |
| 39.9 -76.1 1 |
+---------------+