SQL exercises on movie Database: Find the movie title, year, date of release, director and actor for those movies which reviewer is unknown
SQL movie Database: Subquery Exercise-4 with Solution
4. From the following tables, write a SQL query to find for movies whose reviewer is unknown. Return movie title, year, release date, director first name, last name, actor first name, last name.
Sample table: movie
Sample table: actor
Sample table: director
Sample table: movie_direction
Sample table: movie_cast
Sample table: reviewer
Sample table: rating
Sample Solution:
SELECT mov_title, mov_year, mov_dt_rel, dir_fname, dir_lname,
act_fname, act_lname
FROM movie a, movie_direction b, director c,
rating d, reviewer e, actor f, movie_cast g
WHERE a.mov_id=b.mov_id
AND b.dir_id=c.dir_id
AND a.mov_id=d.mov_id
AND d.rev_id=e.rev_id
AND a.mov_id=g.mov_id
AND g.act_id=f.act_id
AND e.rev_name IS NULL;
Sample Output:
mov_title | mov_year | mov_dt_rel | dir_fname | dir_lname | act_fname | act_lname ----------------------------------------------------+----------+------------+----------------------+----------------------+----------------------+---------------------- Blade Runner | 1982 | 1982-09-09 | Ridley | Scott | Harrison | Ford Princess Mononoke | 1997 | 2001-10-19 | Hayao | Miyazaki | Claire | Danes (2 rows)
Code Explanation:
The said query in SQL that selects various information about movies, directors, actors, and reviewers
from several tables in the movie database, but only for movies that have not been reviewed.
This query retrieve columns movie title, year,
date of release, director first and last names, actor first and last names from the tables join together are 'movie', 'movie_direction', 'director', 'rating', 'reviewer', 'actor', and 'movie_cast'.
The JOIN clause joins the 'movie' and 'movie_direction' table on "mov_id" column the 'movie_direction' and 'director' tables on "dir_id" column, the 'movie' and 'rating' tables on "mov_id" column, the 'rating' and 'reviewer' tables on "rev_id" column the 'movie' and 'movie_cast' tables on "mov_id" column , the 'movie_cast' and 'actor' tables on "act_id" column, and the "rev_name" column in 'reviewer' must be NULL (i.e., the movie has not been reviewed).
Relational Algebra Expression:
Relational Algebra Tree:
Practice Online
Query Visualization:
Duration:

Rows:

Cost:

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Previous: From the following table, write a SQL query to find those movies, which released in the country besides UK. Return movie title, movie year, movie time, date of release, releasing country.
Next: From the following tables, write a SQL query to find those movies directed by the director whose first name is ‘Woddy’ and last name is ‘Allen’. Return movie title.
What is the difficulty level of this exercise?
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SQL: Tips of the Day
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SELECT * FROM ( SELECT ROW_NUMBER() OVER ( ORDER BY OrderDate ) AS RowNum, * FROM Orders WHERE OrderDate >= '1980-01-01' ) AS RowConstrainedResult WHERE RowNum >= 1 AND RowNum < 20 ORDER BY RowNum
Database: SQL Server
Ref: https://bit.ly/3MGrNlk
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