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As mentioned earlier, Oracle allows you to declare a table with one or more columns, the data type of which is an object type or a collection type. There are two categories of such tables: Object table: An object table is a special kind of table in which each row represents an entire object. Essentially, this type of table consists of only one column, the data type of which is an object type. In the following code snippet, we create an object table of type person: benchmark@ORA10G> create table person_table of person; Table created. Table with column objects: A table in which at least one column is of an object type or collection type is called (for lack of a better name) a table with column objects. A column object is an object stored as a column of a table in a row that contains at least one more attribute. For example, the table contacts defined as follows falls under this category: benchmark@ORA10G> create table contacts 2 ( 3 contact_person person, 4 contact_type varchar2(20) 5 ); Table created. Tables can also have columns whose data type is a varray or a nested table. These are typically used in lieu of storing a parent/child relationship. In this section, we ll first discuss how objects can be stored, retrieved, and updated in tables in Oracle in the form of nested tables and varrays. We ll then discuss the reasons this is not, in general, a recommended practice (mainly because it leads to poor performance and increases code complexity). Let s begin with a discussion of how to store varrays in tables.

Errors can occur in a system at any time, including while an event is being fired. What should the event source do if one of the subscribers throws an exception while processing a notification, or if the firing process itself causes an exception To avoid erratic system behavior, the event source should catch the exception and have a strategy for determining what to do next. In general, two courses of action are possible: The sender can either continue firing the event to the remaining subscribers or stop firing the event. The errors that can occur while firing events are obviously application-dependent, but most systems should be prepared to deal with the following special conditions: An event target is unreachable. An event target throws an exception.

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If you double-click a cell in the pivot table, you may see an error message that says, Cannot change this part of a PivotTable report. The Show Details feature may be turned off in the PivotTable Options dialog box. To turn it on, follow these steps: 1. Right-click a cell in the pivot table, and then choose PivotTable Options. 2. On the Data tab, add a check mark to Enable Show Details, and then click OK to close the PivotTable Options dialog box.

In this section, we ll walk through the various steps involved in creating and populating a table with a varray column. While examining some of the techniques involved in populating and retrieving data from a table that contains a varray column, you ll likely start to appreciate the increased code complexity that using objects and collections in tables introduces. Using varrays in tables involves the following steps: 1. Create the varray type. 2. Create the table containing a column of the varray type. 3. Perform Data Manipulation Language (DML) statements on the table containing a column of the varray type. Let s look at each of these steps separately.

An event target returns an unexpected response. A timeout occurs while waiting for target to process a notification. Once an error occurs, the event source may need to log the error. Alternatively, the event source may collect all the errors that occur in a multicast and then log them together.

The first step is to create the varray type itself. The following code creates a varray of varchar2 variables called varray_of_varchars that can store up to ten varchar2(50) entries: benchmark@ORA10G> create or replace type varray_of_varchars as 2 varray(10) of varchar2(50); 3 / Type created.

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