INSERT INTO climber
    (first_name, last_name, email, birthdate)
VALUES
    ('Alice', 'Atlas', 'cryptoqueen@example.com', '2000-04-29'),
    ('Bob', 'Bobblehead', 'codesrus@example.com', '2001-05-15'),
    ('Carol', 'Carolina', 'wonderous@supersecret.org', NULL),
    ('David', 'Divinator', 'iseeall@supersecret.org', NULL),
    ('Mallory', 'Malicious', 'evilincarnate@badplace.net', '1993-11-25'),
    ('Trent', 'Trustworthy', 'alliswell@goodplace.com', '1970-02-14');