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sql - Resources Exceeded during query execution

I'm trying to run a query joining 2 large sets of data and I'm hitting the resources exceeded during query execution error. I've read that there are work around when using Join Each and Group Each but not what those workaround would be.

SELECT 
  year(users.firstseen) as first_year,
  month(users.firstseen) as first_month, 
  DATEDIFF(orders.timestamp,users.firstseen) as days_elapsed,
  count(orders.user_key) as count_orders
FROM 
  [project.orders] as orders
JOIN EACH
  [project.users] AS users
ON
  orders.user_key = users.user_key
WHERE orders.store = 'ios'
GROUP EACH BY 1,2,3

Edit: the following worked:

SELECT
  year(users.firstseen) as firstyear,
  month(users.firstseen) as firstmonth,
  DATEDIFF(orders.timestamp, users.firstseen) as days_elapsed,
  COUNT(users.firstseen) AS count_orders FROM [project.orders] as orders
JOIN EACH( SELECT user_key, firstseen FROM [project.users]
WHERE store_key = 'ios') as users ON orders.user_key = users.user_key
GROUP BY firstyear, firstmonth, days_elapsed
ORDER BY firstyear, firstmonth, days_elapsed
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