Find the number of users who did not write any review.
CREATE TABLE review (u_id VARCHAR); CREATE TABLE useracct (u_id VARCHAR)
SELECT COUNT(*) FROM useracct WHERE NOT u_id IN (SELECT u_id FROM review)
### Context: CREATE TABLE review (u_id VARCHAR); CREATE TABLE useracct (u_id VARCHAR) ### Question: Find the number of users who did not write any review. ### Answer: SELECT COUNT(*) FROM useracct WHERE NOT u_id IN (SELECT u_id FROM review)