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?

Answer 1

Simply use the DISTINCT keyword:

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;