Question

I have a data set with duplicate city names. I wish to get all the records and if the city is duplicated, then just get the first one:

1  London  Fred
2  Paris   Sally
3  London  Marce

I want this returned:

1  London  Fred
2  Paris   Sally

I’m using SQLite, but that shouldn’t matter too much.

Answer 1

SELECT a.*
FROM tableName a
(
    SELECT countryName, MIN(id) minID
    FROM tableName
    GROUP BY countryName
) b ON a.id = b.minID 
         -- AND a.countryName = b.countryName