sqlite nested query with division - sql

Question

I'm a bit new to SQL and am wondering the best way to do this. basically one query returns the denominator, and the outer query needs to return the numerator/denominator as a percent. the same tables are essentially used for each statement.
create table games(
id integer NOT NULL,
name TEXT NOT NULL,
category TEXT NOT NULL
);
create table game_sets(
id integer NOT NULL,
name TEXT NOT NULL,
theme_id integer NOT NULL
);
INSERT INTO games (id, name, category)
VALUES (1, "star wars", "top game"),
(2, "pokemon", "top game"),
(3, "zelda", "top game"),
(4, "crazy cats", "sucky game");
INSERT INTO game_sets(id, name, theme_id)
VALUES (1, "star wars set 1", 1),
(2, "star wars set 2", 1),
(3, "star wars set 3", 1),
(4, "pikachu set 1", 2),
(5, "narf set 1", 4),
(6, "narf set 2", 4),
(7, "narf set 1", 4),
(8, "narf set 1", 4),
(9, "narf set 1", 4),
(10, "narf set 1", 4);
CREATE VIEW top_games AS
SELECT id, name
FROM games
WHERE category ='top game';
--i hard coded 200 below, but it needs to be dynamic
select top_games.name as theme, printf("%.2f", cast(count(game_sets.name)as float)/200) as num_sets_percent from top_games
join game_sets
where top_games.id = game_sets.theme_id
group by top_games.id
order by num_sets desc
limit 2;
--below here is the number i need for the first query to divide
--i have it hard coded as 4 b/c 4 total sets in the game_sets table, but it needs to be dynamic with this query
(select count(game_sets.name) as num_sets from game_sets
join top_games
where top_games.id = game_sets.theme_id) as divide_by_this
output:
star wars, .3 (because 3 star wars sets out of 10 total sets and star wars is a top game)
pokemon, 0.1 (because 1 pokemon set out of 10 total sets and is also a top set)
and last we limited it to only the 2 top sets so the zelda set doesn't show up.

Answer 1

If you have SQLite 3.25.0+ you can use window functions:
select distinct
g.name,
1.0 * count(g.id) over (partition by g.id) / count() over () num_sets_percent
from game_sets s left join top_games g
on s.theme_id = g.id
order by num_sets_percent desc
limit 2
See the demo.
Results:
| name | num_sets_percent |
| --------- | ---------------- |
| star wars | 0.3 |
| pokemon | 0.1 |