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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:

Figure 24-5.

24:

11

having this be the only way in which sets of data attributes can be modeled. First, the database tends to have a great many tables and foreign key relationships and becomes hard to understand. Second, many common queries need to join three, four, or more tables to get the required answers. Third, with the implementations of relational joins provided by most DBMS systems, the performance of queries will deteriorate as they involve more and more joins. An object-oriented model of the engineers and their degrees would tend to reject the table structure of Figure 24-5. It would claim that the degrees are not substantial objects in their own right and deserving of their own table. Instead, they are attributes of the engineer holding the degrees. True, a variable number of degrees are associated with each engineer, but the object-oriented model would have no problem with representing this situation as an array or a set of data within the engineer object. The object-relational databases support this object-oriented view of data by supporting sets, arrays, or other collection data types. A column within a table can be defined to have one of these data types. It will then contain not a single data item value, but a set of data item values. Special SQL extensions allow a user, or more often a stored procedure, to manipulate the set of data items as a whole or to access individual members of the set.

Oracle also supports date/time data, with a single data type called DATE. Like SQL Server s DATETIME type, an Oracle DATE is, in fact, a timestamp. Also like SQL Server, the time part of an Oracle DATE value defaults to midnight if no time is explicitly specified. The default Oracle date format is different from the DB2 and SQL Server formats, so the Oracle version of the query becomes:

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

SELECT NAME, HIRE_DATE FROM SALESREPS WHERE HIRE_DATE >= '14-JUN-89'

Oracle also supports limited date arithmetic, so the DB2-style query can also be specified but without the DAYS keyword: