Q: Find the titles of all movies that have no ratings. select title ans: from movie left outer join rating using (mID) where stars is null;

output: Star Wars Titanic

Q: Some reviewers didn't provide a date with their rating. Find the names of all reviewers who have ratings with a NULL value for the date. select name from reviewer natural join rating where ratingDate is null;

output: Chris Jackson Daniel Lewis

Q:Write a query to return the ratings data in a more readable format: reviewer name, movie title, stars, and ratingDate. Also, sort the data, first by reviewer name, then by movie title, and lastly by number of stars. ans; select name, title, stars, ratingDate from (reviewer natural join rating) natural join movie order by name, title, stars;

output: Ashley White E.T. 3 2011-01-02 Brittany Harris Raiders of the Lost Ark 2 2011-01-30 Brittany Harris Raiders of the Lost Ark 4 2011-01-12 Brittany Harris The Sound of Music 2 2011-01-20 Chris Jackson E.T. 2 2011-01-22 Chris Jackson Raiders of the Lost Ark 4 Chris Jackson The Sound of Music 3 2011-01-27 Daniel Lewis Snow White 4 Elizabeth Thomas Avatar 3 2011-01-15 Elizabeth Thomas Snow White 5 2011-01-19 James Cameron Avatar 5 2011-01-20 Mike Anderson Gone with the Wind 3 2011-01-09 Sarah Martinez Gone with the Wind 2 2011-01-22 Sarah Martinez Gone with the Wind 4 2011-01-27

Q: Find all years that have a movie that received a rating of 4 or 5, and sort them in increasing order. ans: select distinct year from rating natural join movie where stars=4 or stars=5 order by year; output: 1937 1939 1981 2009