SQL exercises on movie Database: Find the names of all reviewers who rated the movie American Beauty
SQL movie Database: Subquery Exercise-12 with Solution
12. From the following table, write a SQL query to find all reviewers who rated the movie ‘American Beauty’. Return reviewer name.
Sample table: reviewer
Sample table: rating
Sample table: movie
Sample Solution:
SELECT DISTINCT reviewer.rev_name
FROM reviewer, rating, movie
WHERE reviewer.rev_id = rating.rev_id
AND movie.mov_id = rating.mov_id
AND movie.mov_title = 'American Beauty';
Sample Output:
rev_name -------------------------------- Sasha Goldshtein (1 row)
Code Explanation:
The said query in SQL that retrieves the names of all reviewers who have rated the movie "American Beauty":
The DISTINCT keyword ensures that only get each reviewer's name once .
The condition joins the reviewer, rating, and movie tables on their respective IDs (rev_id and mov_id), and only selecting rows where the movie title is "American Beauty".
Relational Algebra Expression:

Relational Algebra Tree:

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Query Visualization:
Duration:

Rows:

Cost:

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Previous: From the following tables, write a SQL query to find those movies, which have received highest number of stars. Group the result set on movie title and sorts the result-set in ascending order by movie title. Return movie title and maximum number of review stars.
Next: From the following tables, write a SQL query to find the movies, which have reviewed by any reviewer body except by 'Paul Monks'. 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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