Question

Im tring to get in one query how many items price higher than average price and lower.

My query:

SELECT COUNT(*)
FROM item i
WHERE refine = 0 AND item = 5170
GROUP BY id
HAVING price > AVG(price) - STD(price) AND i.price < AVG(price) + STD(price)

But i get error Unknown column ‘price’ in ‘having clause’

If I’m using AVG and STD functions in SELECT:

SELECT COUNT(*), SUM(price > AVG(price) - STD(price) AND i.price < AVG(price) + STD(price)) as middle
FROM item i
WHERE refine = 0 AND item = 5170

I get error again. How make correct query?

Here link on sqlFiddle

Answer 1

Try this

select count(*) from item as t1 inner join
(
select id,AVG(price) - STD(price) as sum1, AVG(price) + STD(price)  as sum2
from item 
group by id
) as t2
on t1.id=t2.id and t1.price>sum1 and t1.price<sum2