MySQL 8.0

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CREATE TABLE person (id int primary key, first_name text, last_name text, dob date);
SELECT first_name, MAX(dob), ROW_NUMBER() OVER (PARTITION BY last_name ORDER BY first_name) FROM person GROUP BY 1;

Expression #1 of PARTITION BY or ORDER BY clause of window '<unnamed window>' is not in GROUP BY clause and contains nonaggregated column 'fiddle.person.last_name' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

SELECT first_name, MAX(dob), ROW_NUMBER() OVER (PARTITION BY last_name ORDER BY first_name) FROM person GROUP BY 1, last_name;

first_name
MAX(dob)
ROW_NUMBER() OVER (PARTITION BY last_name ORDER BY first_name)