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CREATE TABLE movie ( movieID int, Title varchar(255), `Year` int, Director varchar(50)); insert into movie values (101,'Gone with the Wind',1939,'Victor Fleming'), (102,'Star Wars',1977,'George Lucas'), (103,'The Sound of Music',1965,'Robert Wise'), (104,'E.T.',1982,'Steven Spielberg'), (105,'Titanic',1997,'James Cameron'), (106,'Snow White',1937,null), (107,'Avatar',2009,'James Cameron'), (108,'Raiders of the Lost Ark',1981,'Steven Spielberg'); CREATE TABLE rating ( reviewerID int, movieID int, Stars int, ratingDate date); insert into rating values (201,101,2,'2011-01-22'), (201,101,4,'2011-01-27'), (202,106,4,null), (203,103,2,'2011-01-20'), (203,108,4,'2011-01-12'), (203,108,2,'2011-01-30'), (204,101,3,'2011-01-09'), (205,103,3,'2011-01-27'), (205,104,2,'2011-01-22'), (205,108,4,null), (206,107,3,'2011-01-15'), (206,106,5,'2011-01-19'), (207,107,5,'2011-01-20'), (208,104,3,'2011-01-02'); CREATE TABLE reviewer ( reviewerID int, Name varchar(50)); insert into reviewer values (201,'Sarah Martinez'), (202,'Daniel Lewis'), (203,'Brittany Harris'), (204,'Mike Anderson'), (205,'Chris Jackson'), (206,'Elizabeth Thomas'), (207,'James Cameron'), (208,'Ashley White');
SELECT DISTINCT r.Name,m.Title FROM ( SELECT reviewerID, movieID, Stars, LEAD(Stars) OVER(PARTITION BY reviewerID, movieID ORDER BY ratingDate) n_start FROM rating ) t1 INNER JOIN movie m ON t1.movieID = m.movieID INNER JOIN reviewer r ON r.reviewerID = t1.reviewerID WHERE Stars < t1.n_start
Name
Title
Sarah Martinez
Gone with the Wind