Temporary Table set value.

duplicates.set.value.sql

CREATE TEMPORARY TABLE IF NOT EXISTS duplicates AS (SELECT  mto.id 
FROM    talleres mto
WHERE   EXISTS
        (
        SELECT  1
        FROM    talleres mti
        WHERE   mti.latitud = mto.latitud and mti.longitud = mto.longitud
        LIMIT 1, 1
        ) 
order by id );

update talleres set duplicate = 1 WHERE id IN ( select id from duplicates );

select id, latitud, longitud, duplicate from talleres where duplicate = 1;