Find Values In One Table And Not Another

-- Create table called elves
CREATE TABLE elves (
    -- string variable
    name varchar(255),
    -- integer variable
    age int,
    -- string variable
    race varchar(255),
    -- string variable
    weapon varchar(255)
)

-- Create table called dwarves
CREATE TABLE dwarves (
    -- string variable
    name varchar(255),
    -- integer variable
    age int,
    -- string variable
    race varchar(255),
    -- string variable
    weapon varchar(255)
)

INSERT INTO elves (name, age, race, weapon)
VALUES ('Dallar Woodfoot', 25, 'Elf', 'Bow'),
       ('Cordin Garner', 29, 'Elf', 'Bow'),
       ('Keat Knigh', 24, 'Elf', 'Sword'),
       ('Colbat Nalor', 124, 'Elf', 'Magic')

INSERT INTO dwarves (name, age, race, weapon)
VALUES ('Kalog', 23, 'Dwarf', 'Axe'),
       ('Dranar', 145, 'Dwarf', 'Bow'),
       ('Bratar', 12, 'Dwarf', 'Axe'),
       ('Dragga', 23, 'Dwarf', 'Axe')

-- Retrieve all weapons from elves
SELECT weapon FROM elves
-- Find the unique values that are not in...
EXCEPT
-- Retrieve all weapons from dwarves
SELECT weapon FROM dwarves