MySQL Select 3 random rows where sum of three rows is less than value

Question

I am trying to select three random rows from a table, where their combined item_price column is less than a desired amount.

Imagine you have an

Answer 1

Another solution i get by looking Lashane's answer because each of the item's price must not be greater than the total. There should be some improvement by adding this (try EXPLAIN to the query).

SELECT t1.item_id as id1, t2.item_id as id2, t3.item_id as i3
FROM items t1, items t2, items t3
WHERE
t1.item_price <= 300 AND
t2.item_price <= 300 AND
t3.item_price <= 300 AND
t1.item_id <> t2.item_id AND
t1.item_id <> t3.item_id AND
t2.item_id <> t3.item_id AND
(t1.item_price + t2.item_price + t3.item_price) <= 300
ORDER BY RAND()
LIMIT 1