Find the titles of items that received both a rating higher than 8 and a rating below 5.
SELECT T1.title FROM item AS T1 JOIN review AS T2 ON T1.i_id  =  T2.i_id WHERE T2.rating  >  8 INTERSECT SELECT T1.title FROM item AS T1 JOIN review AS T2 ON T1.i_id  =  T2.i_id WHERE T2.rating  <  5
titles of items that received a rating higher than 8 and below 5 refers to using INTERSECT between two SELECT statements with conditions T2.rating > 8 and T2.rating < 5;