sql - Selecting Distinct combinations.

Question

I have a table which has 2 fields (latitude, longitude) and many other fields. I want to select the distinct combinations of latitude and longitude from this table. what would be the query for that?

question from:https://stackoverflow.com/questions/6870397/selecting-distinct-combinations

Answer 1

Simply use distinct

SELECT DISTINCT Latitude, Longitude 
  FROM Coordinates

This will return values where the (Latitude, Longitude) combination is unique.

This example supposes that you do not need the other columns. If you do need them, i.e. the table has Latitude, Longitude, LocationName columns, you could either add LocationName to the distinct list, or use something along the lines of:

SELECT Latitude, Longitude, MIN(LocationName)
  FROM Coordinates
  GROUP BY Latitude, Longitude