Query (insecure):

SELECT u.email, p.bio
          FROM a03_users u
          JOIN a03_profiles p ON p.user_id = u.id
          WHERE p.bio LIKE '%%'
          ORDER BY u.id ASC LIMIT 50

email	bio
admin_inj@example.com	test
alice_inj@example.com	Hello, I am Alice.
bob_inj@example.com	Hi, Bob here.