cleaning up db of redundant data

Question

locid   country city
39409   US  Aaronsburg
128426  US  Aaronsburg
340356  US  Aaronsburg
429373  US  Aaronsburg
422717  US  Abbeville
431344  US  Abbeville
433062           


        

Answer 1

Create a new table with new auto_increment field and just select them with GROUP BY into the new table

Not tested but should look like this:

INSERT INTO new_table(country, city) 
SELECT country, city FROM old_table 
GROUP BY country,city

EDIT: You could drop the old_table and rename the new_table afterwards.