Question

this is what I tried but I’m sure it’s wrong.

SELECT count(12), genre
    , MIN(cost) AS Low
    , MAX(cost) AS High
    , AVG(cost) AS Average 
FROM movies
where YR > '1990'
GROUP BY genre 

Answer 1

This is my impression of the query you were making

SELECT
    COUNT(12),
    genre,
    MIN(cost) AS Low,
    MAX(cost) AS High,
    AVG(cost) AS Average
FROM movies
WHERE YR > '1990'
GROUP BY genre

I am not sure what it is you are trying find. Are you are trying to get all the genres that have more than 12 movies between 1990 and the present?

SELECT
    COUNT(*) AS c,
    genre,
    MIN(cost) AS Low,
    MAX(cost) AS High,
    AVG(cost) AS Average
FROM movies
WHERE YR > '1990'
GROUP BY genre
HAVING c > 12