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List all movies where the description of the movie genre contains the word and . This requires a subselect to nd the values of MOVIE_GENRE_ CODE that have the word and in their description. Then the IN operator is used to nd movies that have one of the codes selected in the subselect. Subselects are covered in more detail in 5. For now, just keep in mind that the inner select (the one in parentheses) is executed rst and the result set from the inner select is used as the list of values by the IN operator in the outer select. Note that while several genres have descriptions that contain the word and , only one of these categories (Action and Adventure, or ActAd ) currently has movies in the video store. Of course, this is not a bad thing at all because this query can be run at a later time when the inventory might contain those additional genres.
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SELECT MOVIE_GENRE_CODE AS GENRE, MOVIE_TITLE FROM MOVIE WHERE MOVIE_GENRE_CODE IN (SELECT MOVIE_GENRE_CODE FROM MOVIE_GENRE WHERE MOVIE_GENRE_DESCRIPTION LIKE '% and %') ORDER BY MOVIE_GENRE_CODE, MOVIE_TITLE; GENRE ----ActAd ActAd ActAd ActAd ActAd ActAd ActAd MOVIE_TITLE -----------------------------------------Kill Bill: Vol. 1 Man on Fire Master and Commander: The Far Side of the Pirates of the Caribbean: The Curse of the The Day After Tomorrow The Italian Job The Last Samurai
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The EXISTS operator is used to determine if a subselect has any rows in it. If there are no rows in the subselect s result set, a logical false is set; if the result set has one or more rows in it, a logical true is set. Again, subselects are covered in more detail in 5, but here is an example using EXISTS so you can see how it works: The store manager has heard that the movie The Last Samurai rents well in both DVD and VHS formats, and she wants to be sure there is a
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VHS copy in the store s inventory. The MOVIE_COPY table has a row for each copy of a movie in the inventory, so you can use a subselect to nd out if there are VHS copies of the movie in inventory. The EXISTS operator is most often used in conjunction with a more complicated form of subquery call a correlated subquery, where a data value from the outer select (the MOVIE_ID in this case) is matched against rows in the inner query. If you nd the syntax in this example confusing, don t be overly concerned because we ll revisit it in 5. For now, just know that the subselect will return a row if the movie has a VHS copy in stock and will return no rows if not. By the way, this same query could also be written using the IN operator or using a join, which matches rows in the two tables. Joins are also covered in 5.
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SELECT MOVIE_ID, MOVIE_TITLE FROM MOVIE m WHERE MOVIE_TITLE = 'The Last Samurai' AND EXISTS (SELECT MOVIE_ID FROM MOVIE_COPY c WHERE m.MOVIE_ID = c.MOVIE_ID); MOVIE_ID MOVIE_TITLE ---------- -----------------2 The Last Samurai 1 row selected.
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If you reverse the logic using a NOT EXISTS, you can list the movie title only if there is not a VHS copy in the inventory.
SELECT MOVIE_ID, MOVIE_TITLE FROM MOVIE m WHERE MOVIE_TITLE = 'The Last Samurai' AND NOT EXISTS (SELECT MOVIE_ID FROM MOVIE_COPY c WHERE m.MOVIE_ID = c.MOVIE_ID); no rows selected
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