Which school requested the highest amount of resources from Amazon? State the school's ID.
highest amount of resources refers to max(count(schoolid)); Amazon refers to vendor_name = 'Amazon'
SELECT T2.schoolid FROM resources AS T1 INNER JOIN projects AS T2 ON T1.projectid = T2.projectid WHERE T1.vendor_name LIKE 'Amazon' GROUP BY T2.schoolid ORDER BY COUNT(T1.vendor_name) DESC LIMIT 1