I have this table in SQL:

CREATE TABLE mytable (
    id     BIGINT,
    color  VARCHAR(10),
    food   VARCHAR(10),
    sport  VARCHAR(12),
    animal VARCHAR(10)
) DISTRIBUTE ON (id);

INSERT INTO mytable (id, color, food, sport, animal) VALUES
( 1, 'red',    'pizza',  'soccer',     'dog'),
( 2, 'blue',   'sushi',  'tennis',     'cat'),
( 3, 'green',  'tacos',  'basketball', 'horse'),
( 4, 'yellow', 'pasta',  'golf',       'rabbit'),
( 5, 'pink',   'pizza',  'swimming',   'fox'),
( 6, 'orange', 'burger', 'soccer',     'bear'),
( 7, 'black',  'ramen',  'hockey',     'wolf'),
( 8, 'purple', 'tacos',  'cricket',    'cat'),
( 9, 'white',  'salad',  'tennis',     'dog'),
(10, 'brown',  'pizza',  'running',    'deer'),
(11, 'cyan',   'curry',  'boxing',     'tiger'),
(12, 'gray',   'sushi',  'soccer',     'horse'),
(13, 'teal',   'burger', 'baseball',   'owl'),
(14, 'maroon', 'pasta',  'golf',       'dog'),
(15, 'navy',   'tacos',  'rugby',      'frog');

I want to randomly select 15 rows from this table (i.e. sampling without replacement).

The final result should look something like this:

resample_id | original_id | color  | food   | sport      | animal
------------+-------------+--------+--------+------------+--------
     1      |     7       | black  | ramen  | hockey     | wolf
     2      |     3       | green  | tacos  | basketball | horse
     3      |     7       | black  | ramen  | hockey     | wolf
     4      |    12       | gray   | sushi  | soccer     | horse
     5      |     1       | red    | pizza  | soccer     | dog
     6      |    15       | navy   | tacos  | rugby      | frog
     7      |     7       | black  | ramen  | hockey     | wolf
     8      |     9       | white  | salad  | tennis     | dog
     9      |     3       | green  | tacos  | basketball | horse
    10      |    14       | maroon | pasta  | golf       | dog
    11      |     2       | blue   | sushi  | tennis     | cat
    12      |    12       | gray   | sushi  | soccer     | horse
    13      |     5       | pink   | pizza  | swimming   | fox
    14      |    10       | brown  | pizza  | running    | deer
    15      |     5       | pink   | pizza  | swimming   | fox

I thought of the following logic - generate random numbers corresponding to the rows that need to be selected and then join them back to the original table:

SELECT
    g.i AS resample_id, 
    t.id AS original_id, 
    t.color, t.food,
    t.sport,
    t.animal
FROM (
    SELECT ROW_NUMBER() OVER (ORDER BY NULL) AS i,
           CAST((RANDOM() * 15) AS BIGINT) + 1 AS pick_id
    FROM mytable
    LIMIT 15
) g
JOIN mytable t ON t.id = g.pick_id
ORDER BY g.i;

This is giving me an empty response.

Can someone please help me figure out what I am doing wrong?