What is the biggest discount among all orders for the part "burnished seashell gainsboro navajo chocolate"?
the biggest discount refers to max(l_discount); part "burnished seashell gainsboro navajo chocolate" refers to p_name = 'burnished seashell gainsboro navajo chocolate'
SELECT MAX(T1.l_discount) FROM lineitem AS T1 INNER JOIN part AS T2 ON T1.l_partkey = T2.p_partkey WHERE T2.p_name = 'burnished seashell gainsboro navajo chocolate'