CREATE TABLE business (bid INT, business_id VARCHAR, name VARCHAR, full_address VARCHAR, city VARCHAR, latitude VARCHAR, longitude VARCHAR, review_count BIGINT, is_open TINYINT, rating FLOAT, state VARCHAR)
CREATE TABLE checkin (cid INT, business_id VARCHAR, count INT, day VARCHAR)
CREATE TABLE category (id INT, business_id VARCHAR, category_name VARCHAR)
CREATE TABLE neighborhood (id INT, business_id VARCHAR, neighborhood_name VARCHAR)
CREATE TABLE tip (tip_id INT, business_id VARCHAR, text TEXT, user_id VARCHAR, likes INT, year INT, month VARCHAR)
CREATE TABLE user (uid INT, user_id VARCHAR, name VARCHAR)
CREATE TABLE review (rid INT, business_id VARCHAR, user_id VARCHAR, rating FLOAT, text TEXT, year INT, month VARCHAR)

How many businesses has Michelle reviewed in 2010 ?
SELECT COUNT(DISTINCT (business.name)) FROM business, review, user WHERE review.business_id = business.business_id AND review.year = 2010 AND user.name = 'Michelle' AND user.user_id = review.user_id
SELECT COUNT(DISTINCT "business"."name") FROM "business" JOIN "review" ON "business"."business_id" = "review"."business_id" AND "review"."year" = 2010 JOIN "user" ON "review"."user_id" = "user"."user_id" AND "user"."name" = 'Michelle'