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PERFORMER_ID -----------2001 2002 2003 2004 2005 2006 2007 2008 2009 PERFORMER_NAME -----------------Jennifer Warnes Joni Mitchell William Ackerman Kitaro Bing Crosby Patsy Cline Jose Carreras Luciano Pavarotti Placido Domingo PLACE_OF_BIRTH -----------------------------Seattle, Washington, USA Fort MacLeod, Alberta, Canada Germany Toyohashi, Japan Tacoma, Washington, USA Winchester, Virginia, USA Barcelona, Spain Modena, Italy Madrid, Spain

Figure 24-1 shows some sample data for this table and the hierarchical column/field structure created by the abstract data types. Oracle supports abstract data types through a very similar structure, with slightly different SQL syntax. Here is the Oracle CREATE TYPE statement to create the same abstract data structure for names and addresses:

Notice that every row and every column is returned in the query results. If you use the asterisk in your SELECT clause, you do not have to specify the column names. Now suppose you want to return only the PERFORMER_NAME and PLACE_OF_BIRTH columns. You could modify your SELECT statement to look like the following:

CREATE TYPE F_NAME M_INIT L_NAME NAME_TYPE AS OBJECT ( VARCHAR2(15), CHAR(1), VARCHAR2(20));

CREATE TYPE POST_TYPE AS OBJECT ( MAIN NUMBER, SFX NUMBER); CREATE TYPE STREET CITY STATE POSTCODE ADDR_TYPE AS OBJECT ( VARCHAR2(35), VARCHAR2(15), CHAR(2), POST_TYPE);

SELECT PERFORMER_NAME AS NAME, PLACE_OF_BIRTH FROM PERFORMERS;

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Oracle calls the abstract data type an object instead of a row type. In fact, the type is functioning as an object class in the usual object-oriented terminology. Extending the objectoriented terminology further, the individual components of an Oracle abstract data type are referred to as attributes (corresponding to the Informix fields described earlier). The ADDR_ TYPE type has four attributes in this example. The fourth attribute, POSTCODE, is itself an abstract data type. Both Oracle and Informix use the extended dot notation to refer to individual data elements within abstract data types. With nested abstract types, it takes several levels of dot-delimited names to identify an individual data item. The main postal code within the PERSONNEL table is identified as:

If the table were owned by another user, Sam, the qualified name would become even longer:

7:

Part VI:

Your query results will now contain only two columns, as shown in the following:

Informix allows the use of row types to go one step beyond their role as data type templates for individual columns. You can use a row type to define the structure of an entire table. For example, with this row type definition:

CREATE ROW EMPL_NUM NAME ADDRESS TYPE PERS_TYPE ( INTEGER, NAME_TYPE, ADDR_TYPE);

NAME ----------------Jennifer Warnes Joni Mitchell William Ackerman Kitaro Bing Crosby Patsy Cline Jose Carreras Luciano Pavarotti Placido Domingo PLACE_OF_BIRTH -----------------------------Seattle, Washington, USA Fort MacLeod, Alberta, Canada Germany Toyohashi, Japan Tacoma, Washington, USA Winchester, Virginia, USA Barcelona, Spain Modena, Italy Madrid, Spain

you can define the PERSONNEL table using the row type as a model:

CREATE TABLE PERSONNEL OF TYPE PERS_TYPE;

Notice that the name of the first column is NAME, rather than PERFORMER_NAME. This is because the AS subclause (specifying NAME) is defined as part of the PERFORMER_ NAME derived column. If you were to specify the DISTINCT keyword in this particular situation, you would still receive the same number of rows, although they might not be returned in the same order as they were when you didn t use the keyword, depending on the SQL implementation. The reason that the DISTINCT keyword would make no difference in the query results is that there are no duplicate rows in the table. However, using the DISTINCT keyword can affect performance, particularly if your RDBMS has to sort through a large number of rows, so be sure to use the keyword only when necessary. Now let s take a look at an example that uses the DISTINCT keyword. Suppose your database includes a table that matches performers to types of music, as shown in Figure 7-2.

The columns of this PERSONNEL table will be exactly as they were in the previous CREATE TABLE examples, but now PERSONNEL is a typed table. The most basic use of the typed table capability is to formalize the object structure in the database. Each object class has its own row type, and the typed table that holds objects (rows) of that class is defined in terms of the row type. Beyond this usage, typed tables are also a key component of the Informix notion of table inheritance, described later in the Inheritance section.

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