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Retrieving Data Using Data Query Language
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RATIN ----PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 R R R R R R R R R
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GENRE ----Rmce Rmce Drama Comdy Comdy Comdy Comdy ActAd ActAd ActAd ActAd Forgn Drama Drama Drama Drama Drama ActAd ActAd ActAd
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MOVIE_TITLE -----------------------------------------Two Weeks Notice 13 Going on 30 Big Fish Something's Gotta Give 50 First Dates The School of Rock Matchstick Men The Italian Job Master and Commander: The Far Side of the Pirates of the Caribbean: The Curse of the The Day After Tomorrow Das Boot Mystic River Cold Mountain Road to Perdition Lost in Translation Monster The Last Samurai Man on Fire Kill Bill: Vol. 1
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20 rows selected.
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Did you notice the following differences As speci ed, Genre is sorted in descending order within Rating. Oracle displayed RATIN instead of RATING as the column header in the result set. The column alias really is RATING , but Oracle s SQL*Plus automatically shortens column headers if they are longer than the longest data value in the column s data (a trait I have never particularly liked). The good news is that this behavior can be changed with some formatting commands that come with SQL*Plus, which we won t go into here. The better news is that Oracle s latest SQL Client, iSQL*Plus, doesn t behave this way at all. However, the real lesson here is that there is a wide variation in the behavior of the various databases and SQL clients, and you have to be ready to deal with those differences. The completion message at the end of the result set is 20 rows selected. instead of (20 row(s) affected) .
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SQL uses the WHERE clause for the selection of rows to display. As you have already seen, a query without a WHERE clause yields a result set that contains all the rows in the table(s) or view(s) referenced in the FROM clause. When a WHERE clause is included, the rules of Boolean algebra, named for logician George Boole, are used to evaluate the WHERE clause for each row of data. Only rows for which the WHERE clause evaluates as a logical true are displayed in the query results. As you will see in the examples that follow, individual tests of conditions must evaluate as true, false, or unknown. Actually, the unknown result is not part of Boolean algebra at all it comes from the use of null values in relational databases. See IS NULL in the Logical Operators section a bit later in this chapter.
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Comparison operators are used in the WHERE clause to compare two values, yielding a logical true or false as a result. The two values being compared may be constants supplied in the WHERE clause, column values from the database, or a combination of the two. The comparison operators that can be used in WHERE clauses are shown in the following table:
Operator = < <= > >= != <> Description Equal to Less than Less than or equal to Greater than Greater than or equal to Not equal to Not equal to (ANSI standard)
Here are some examples: List all movies with an MPAA Rating of PG-13.
SELECT MPAA_RATING_CODE AS RATING, MOVIE_TITLE FROM MOVIE WHERE MPAA_RATING_CODE = 'PG-13' ORDER BY MOVIE_TITLE;
Retrieving Data Using Data Query Language
RATING -----PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13 PG-13
MOVIE_TITLE -----------------------------------------------13 Going on 30 50 First Dates Big Fish Master and Commander: The Far Side of the World Matchstick Men Pirates of the Caribbean: The Curse of the Black Something's Gotta Give The Day After Tomorrow The Italian Job The School of Rock Two Weeks Notice
11 rows selected.
List all movies with an MPAA Rating other than PG-13. Notice that there are 20 rows in the MOVIE table, and the DBMS found 11 of them matching on PG-13, so it seems logical that it would nd the other 9 that are not equal to PG-13. However, if there were a null value in the column, that row would not appear in the results of either of these queries. It will seem odd to you at rst, but a null value isn t equal to PG-13 and it isn t not equal to PG-13 it s just null. You ll see more on null values in an upcoming topic.
SELECT MPAA_RATING_CODE AS RATING, MOVIE_TITLE FROM MOVIE WHERE MPAA_RATING_CODE <> 'PG-13' ORDER BY MOVIE_TITLE; RATING -----R R R R R R R R R MOVIE_TITLE -----------------------------------------------Cold Mountain Das Boot Kill Bill: Vol. 1 Lost in Translation Man on Fire Monster Mystic River Road to Perdition The Last Samurai
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