SELECT t1.name FROM swimmer AS t1 JOIN record AS t2 ON t1.id = t2.swimmer_id GROUP BY t2.swimmer_id ORDER BY COUNT(*) DESC LIMIT 1
Find the name of the swimmer who has the most records.
CREATE TABLE stadium (
    id number,
    name text,
    capacity number,
    city text,
    country text,
    opening_year number
)

CREATE TABLE record (
    id number,
    result text,
    swimmer_id number,
    event_id number
)

CREATE TABLE swimmer (
    id number,
    name text,
    nationality text,
    meter_100 number,
    meter_200 text,
    meter_300 text,
    meter_400 text,
    meter_500 text,
    meter_600 text,
    meter_700 text,
    time text
)

CREATE TABLE event (
    id number,
    name text,
    stadium_id number,
    year text
)