Among the parts supplied by Supplier#000000018, provide parts names which had supply costs above 900.
Supplier#000000018 is the name of supplier which refers to s_name; supply costs above 900 refer to ps_supplycost > 900;
SELECT T2.p_name FROM partsupp AS T1 INNER JOIN part AS T2 ON T1.ps_partkey = T2.p_partkey INNER JOIN supplier AS T3 ON T1.ps_suppkey = T3.s_suppkey WHERE T1.ps_supplycost > 900 AND T3.s_name = 'Supplier#000000018'