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List all movies that are rated PG-13 and are either in the drama or actionadventure genre. While the intent may seem clear in the previous sentence, if the WHERE clause is written exactly as stated and without parentheses, you get incorrect results. The problem is that AND is evaluated before OR, which means that you will get all the movies with genre ActAd regardless of their rating. Here is the statement written that way and the unintended result set:
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SELECT MOVIE_GENRE_CODE AS GENRE, MPAA_RATING_CODE AS RATING, MOVIE_TITLE FROM MOVIE WHERE MOVIE_GENRE_CODE = 'ActAd' OR MOVIE_GENRE_CODE = 'Drama' AND MPAA_RATING_CODE = 'PG-13' ORDER BY MOVIE_GENRE_CODE, MPAA_RATING_CODE; GENRE ----ActAd ActAd ActAd ActAd ActAd ActAd ActAd Drama RATING -----PG-13 PG-13 PG-13 PG-13 R R R PG-13 MOVIE_TITLE -------------------------------------The Italian Job Pirates of the Caribbean: The Curse of The Day After Tomorrow Master and Commander: The Far Side of The Last Samurai Man on Fire Kill Bill: Vol. 1 Big Fish
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Let s add parentheses so all the movies are PG-13 and either ActionAdventure or Drama. Here is the corrected statement and the results (which are now as intended):
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SELECT MOVIE_GENRE_CODE AS GENRE, MPAA_RATING_CODE AS RATING, MOVIE_TITLE FROM MOVIE WHERE (MOVIE_GENRE_CODE = 'ActAd' OR MOVIE_GENRE_CODE = 'Drama') AND MPAA_RATING_CODE = 'PG-13' ORDER BY MOVIE_GENRE_CODE, MPAA_RATING_CODE; GENRE RATING MOVIE_TITLE ----- ------ -------------------------------------ActAd PG-13 The Italian Job ActAd PG-13 Pirates of the Caribbean: The Curse of ActAd PG-13 Master and Commander: The Far Side of ActAd PG-13 The Day After Tomorrow Drama PG-13 Big Fish 5 rows selected.
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Logical operators use keywords instead of symbols when forming comparisons. The logical operators available in most SQL implementations are presented in topics that follow. The keyword NOT can be added to any of them to logically reverse the comparison.
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The IS NULL operator is used to determine if a value is null. It is important to remember that null values in the database are not equal to anything else, including another null value. This is why a condition such as = NULL is always incorrect nothing is ever equal to a null value. Here are some examples: Find all active customer accounts, which are those where the DATE_ TERMINATED column contains a null value:
SELECT CUSTOMER_ACCOUNT_ID FROM CUSTOMER_ACCOUNT WHERE DATE_TERMINATED IS NULL;
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CUSTOMER_ACCOUNT_ID ------------------1 2 3 4 5 7 8 9 8 rows selected.
Find all inactive customer accounts, which are those where the DATE_ TERMINATED column contains a value other than null:
SELECT CUSTOMER_ACCOUNT_ID FROM CUSTOMER_ACCOUNT WHERE DATE_TERMINATED IS NOT NULL; CUSTOMER_ACCOUNT_ID ------------------6 1 row selected.
BETWEEN
The BETWEEN operator is used to determine if a value falls within a range. The range is speci ed using a minimum value and a maximum value, and the range is inclusive, which means that the minimum and maximum values are included in the range. This is a nice shorthand way of writing a range condition that is also easier to read and understand. For instance, the condition WHERE MOVIE_ID BETWEEN 7 AND 9 is the same as the condition WHERE MOVIE_ID >= 7 AND MOVIE_ID <= 9 . Here are some examples: Find all movies with a RETAIL_PRICE_DVD between 14.99 and 19.99. Notice that movies with a price of exactly 14.99 or 19.99 are included in the result set.
SELECT FROM WHERE ORDER MOVIE_TITLE, RETAIL_PRICE_DVD MOVIE RETAIL_PRICE_DVD BETWEEN 14.99 AND 19.99 BY RETAIL_PRICE_DVD;
MOVIE_TITLE RETAIL_PRICE_DVD -------------------- ---------------Road to Perdition 14.99 Big Fish 19.94 Das Boot 19.94 50 First Dates 19.94 Mystic River 19.96 The Last Samurai 19.96 Matchstick Men 19.97 The Italian Job 19.99 8 rows selected.
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List all movies with a RETAIL_PRICE_DVD that is not between 14.99 and 19.99. Notice that movies with a price of exactly 14.99 and 19.99 are not included, and only those with a price less than 14.99 or greater than 19.99 are selected.
SELECT FROM WHERE ORDER MOVIE_TITLE, RETAIL_PRICE_DVD MOVIE RETAIL_PRICE_DVD NOT BETWEEN 14.99 AND 19.99 BY RETAIL_PRICE_DVD;
MOVIE_TITLE RETAIL_PRICE_DVD -------------------- ---------------Two Weeks Notice 14.97 Lost in Translation 14.98 13 Going on 30 28.95 Man on Fire 29.98 The Day After Tomorr 29.98 Something s Gotta Gi 29.99 Cold Mountain 29.99 Monster 29.99 The School of Rock 29.99 Kill Bill: Vol. 1 29.99 Pirates of the Carib 29.99 Master and Commander 39.99 12 rows selected.
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