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What is the average number of orders purchased across all vendors? What is the average cost across all vendors?
avg(i.num_orders) as average_num_orders,
avg(i.subtotal) as average_subtotal
from (
count(distinct x.purchaseorderid) as num_orders,
sum(x.subtotal) as subtotal
from purchasing.purchaseorderheader x
left join purchasing.vendor y
on x.vendorid = y.businessentityid
group by
) i;
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