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You can see that Oracle has sorted the two tables 2,500 and 2,000 rows, respectively, to produce 10 and 9 rows of output, respectively. The third sort takes place after the intersection has produced its 9 rows. If you remove the redundant distinct operation from the query, this third sort operation disappears. Both versions do the redundant sort but only 10g admits to it in the execution plan.

If you do already have this person in your Contact list, then you should copy-and-paste this contact s PIN into the associated contact record. Do so by following these steps: 1. 2.

Note I pointed out much earlier on in this chapter that the sort statistics get printed twice the way the second printouts appear in reverse order in this example gives you an interesting insight into the stack-driven nature of the run-time engine.

As in classic C++, constructors are not inherited. Each derived class must define appropriate constructors. The base class constructor may be called from the derived class constructor for reference classes in the usual way by using the initializer list, as in Listing 8-13. Listing 8-13. Calling a Base Class Constructor // constructor_inheritance.cpp using namespace System; ref class MyBase { int data; public: MyBase() { Console::WriteLine("MyBase::MyBase()"); } MyBase(int data_in) : data(data_in) { Console::WriteLine("MyBase::MyBase(int)"); } }; ref class Derived : MyBase { public: // Invoke the base class constructor. Derived(int data) : MyBase(data) { Console::WriteLine("Derived::Derived(int)"); } }; int main() { // Derived d; // illegal: ctor w/o args not inherited MyBase b; Derived d(100); } The output of Listing 8-13 is shown here: MyBase::MyBase() MyBase::MyBase(int) Derived::Derived(int) Even though the code looks very similar to what you would do with native classes in classic C++, there is an important difference. The order in which initializer code is called is not the same as in classic C++. Listing 8-14 demonstrates this. In this example, there is a classic C++ inheritance hierarchy in a native type, and the same hierarchy with a reference type. In both cases, a field is initialized by the derived class constructor. The code is parallel in every way, and yet the behavior is different.

Highlight the PIN number. Click the Trackpad and select Copy. Press the Menu key and select Switch Application. Or, you can press the Alt + Escape multitasking hot-key combination.

One of the most important things you can learn from this example is that even though the optimizer will sometimes lie to you, when it comes to sorting, the 10032 trace can tell you what has really happened.

Locate and click your Contact list, if it is visible in the popup window. Otherwise, click the Home screen icon and launch your Contact list by clicking the Contact list icon.

I ve already made this point several times in this book, but here it is just one last time. What the engine does at run time isn t necessarily what the optimizer thought about when costing. Here s a lovely example of an amazing run-time trick that the optimizer (currently) knows nothing about. The script is short_sort.sql in the online code suite: create table t1 as with generator as ( select --+ materialize rownum id, substr(dbms_random.string('U',6),1,6) sortcode from all_objects where rownum <= 5000 ) select /*+ ordered use_nl(v2) */ substr(v2.sortcode,1,4) || substr(v1.sortcode,1,2) sortcode from generator v1, generator v2 where rownum <= 1 * 1048576 ; -Collect statistics using dbms_stats here

Listing 8-14. Order of Initialization // constructor_order.cpp using namespace System; class NativeClass { public: NativeClass() { Console::WriteLine("NativeClass: Field constructor."); } }; ref class ManagedClass { public: ManagedClass() { Console::WriteLine("ManagedClass: Field constructor."); } }; class NativeBase { public: NativeBase() { Console::WriteLine("NativeBase: Base class constructor."); } }; class NativeDerived : NativeBase { NativeClass field; public: NativeDerived() : field() { Console::WriteLine("Native: Derived class constructor."); } };

select sortcode from t1 order by sortcode ;

Type a few letters of the person s first, last, or company name to find him, and then press the Menu key and select Edit.