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MOVIE_GENRE_CODE MPAA_RATING_CODE ---------------- ---------------Drama R ActAd R Comdy PG-13 ActAd PG-13 ... ... (20 row(s) affected)
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MOVIE_TITLE ---------------------Mystic River The Last Samurai Something's Gotta Give The Italian Job ...
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Note the following: The result set shown was generated by Microsoft SQL Server. If you try it with a different DBMS, the format might be a little different. The rows in the result set are in no particular order. You will learn how to specify the order in which you want rows returned in the next section. All rows in the MOVIE table were returned because we did not tell the DBMS to limit the rows. You ll learn how to do this in an upcoming topic. The last line of the result set is a message telling you that the statement ran successfully, which is sometimes called feedback. The message shown here came from Microsoft SQL Server. Other DBMSs use different message formats. For example, Oracle would have displayed 20 rows selected. instead. You may have noticed that the data in the MOVIE_GENRE column isn t always clear. It s easy to see the meaning of Drama and Comdy (Comedy), but ActAd (Action/Adventure) is mighty cryptic. These are codes for movie categories, and the MOVIE_GENRE_CODE column in the MOVIE table is a foreign key to the MOVIE_GENRE table. As an alternative design, I could have simply numbered the categories, but when there are a relatively small number of values, I prefer codes that are easier for humans to remember, often called mnemonic values. In 5 you will learn how to combine columns from multiple tables in a single SELECT statement, called joining tables, which in this example would allow us to replace the MOVIE_GENRE_CODE column with the MOVIE_GENRE_ DESCRIPTION from the MOVIE_GENRE table, yielding a much more user-friendly result set. I have indented the line containing the FROM clause so it aligns nicely with the line above it. This is not at all necessary, but formatting SQL in this way is a nice practice because it makes your SQL easier to read.
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You may have noticed in the result set of the previous query that the column names from the table automatically appear as the column headers in the result set. However, it doesn t have to be this way because the SQL statement provides a convenient way to give the columns aliases. The aliases then become the column names in the result set. One word of caution, however the aliases do not exist until after the SQL statement has run, so they cannot be used in most other parts of the SQL statement. A column alias is assigned by placing the keyword AS after the column name in the SELECT list (with at least one space before and after it), followed by the name you wish to assign to the column in the result set. Many DBMSs will allow you to omit the AS keyword, simply leaving a space between the column name and alias name the SQL engine knows it s an alias instead of the next column name because commas are used to separate column names in the SELECT list. In essence, the alias renames the column but only in the result set. Here is the same SQL statement I used before, with MOVIE_GENRE_CODE renamed to GENRE and MPAA_RATING_CODE renamed to RATING. As before, only the rst four rows are displayed here:
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SELECT MOVIE_GENRE_CODE AS GENRE, MPAA_RATING_CODE AS RATING, MOVIE_TITLE FROM MOVIE; GENRE ----Drama ActAd Comdy ActAd RATING -----R R PG-13 PG-13 MOVIE_TITLE ------------------------Mystic River The Last Samurai Something's Gotta Give The Italian Job
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Query results are often more useful if we specify a sequence for the returned rows that makes sense to the person or application program that will be using the information. There is no guarantee as to the sequence of the rows in the result set unless the desired sequence is speci ed in the query. In SQL, this is done by adding an ORDER BY clause to the SELECT statement, with a list of one or more columns that will be used to order the rows in ascending or descending sequence according to the data values in the columns. Also note the following points:
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