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SQL Moving Rating Practice by Han Wang 20200720
drop table if exists HanW_movie; drop table if exists HanW_reviewer; drop table if exists HanW_rating; create table HanW_movie("mid" int, "title" text, "year" int, "director" text); create table HanW_reviewer("rid" int, "name" text); create table HanW_rating1("rid" int, "mid" int, "stars" int, "ratingdate" date); insert into HanW_movie("mid","title","year","director") 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'); insert into HanW_reviewer("rid","name") 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'); insert into HanW_rating1("rid", "mid", "stars", "ratingdate") 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'); -- HanW_movie("mid", "title", "year", "director"); -- HanW_reviewer("rid", "name"); -- HanW_rating1("rid", "mid", "stars", "ratingdate"); -- Q1 Find the titles of all movies directed by Steven Spielberg SELECT DISTINCT title FROM HanW_movie WHERE director in ('Steven Spielberg') ; --Q2 Q3 Q4 Q5 Q6 Q7 Q8
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1280. Students and Examinations
Recursive inefficiency
test
Leet Code 185
Assignment 1(SET A)
Q2
m,,nm,
Return IDs where there are exactly 3 occurrences
Query integer in text field - Seemingly doesn't work as expected
nested array to table