select 30 random rows where sum amount = x

Question

I have a table

items
id int unsigned auto_increment primary key,
name varchar(255)
price DECIMAL(6,2)

I want to get at least 30 random ite

Answer 1

Depending on the average price and the price distribution you could try something like this:

1. Randomly select a few items less than you want in total (e.g. 25). Retry until their total amount is less than x.

2. Then use the concept linked in your question to find a combination that provides the remaining amount.