Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE trust ( source_u_id number, target_u_id number, trust number )
TABLE: CREATE TABLE review ( a_id number, u_id number, i_id number, rating number, rank number )
TABLE: CREATE TABLE item ( i_id number, title text )
TABLE: CREATE TABLE useracct ( u_id number, name text )

### Question ###
Find the number of items that did not receive any review.

### Accurate SQL ###

SELECT COUNT(*) FROM item WHERE NOT i_id IN (SELECT i_id FROM review)