cat use min as condition
the where statement is where it breaks but i cant fix it
select category, count(*) as number_of_cats
from books
where number_of_cats > min(number_of_cats)
group by category
order by category;
Having + sub-query
select category, count(*) as number_of_books
from books
group by category
having count(*) > -- check the one whose count is STRICTLY greater then minimum
( select min (st.t) -- find the minimum of all categories
from
( select count(*) as t --find the count for all categories
from books
group by category
) st -- an alias to avoid parsing errors
)
Another option, but with this solution in case of ex-aequo only first category is removed:
select select category, count(*) as number_of_books
from books
where category not in (select bb.category
from books bb
group by bb.category
order by count(*) asc
limit 1)
group by category
You could use common table expressions here, eg:
WITH CategoryCount AS (
SELECT
category,
COUNT(*) AS number_of_books
FROM
books
GROUP BY
category),
MinBooks AS (
SELECT
MIN(number_of_books) AS min_number_of_books
FROM
CategoryCount)
SELECT
cc.*
FROM
CategoryCount cc
CROSS JOIN MinBooks m
WHERE
cc.number_of_books > m.min_number_of_books;
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