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When using the for each statement to iterate over a dictionary collection, use the KeyValuePair generic class as shown in the previous example. If the key is not found, a KeyNotFoundException is thrown. If an attempt is made to add a duplicate key, an ArgumentException is thrown by the Add method.

Once you select your ring tone, you will see it listed at the very bottom of the contact entry. Press the Menu key and select Save when you are done and save the changes.

Unless your system has been cursed with single-column synthetic keys all over the place, you will probably write some SQL that involves two, or more, columns being used in the join condition between two tables. So how do you extend the basic formula to deal with multicolumn joins The strategy is exactly the same one you would use for multiple predicates on a single table just apply the formula once for each predicate in turn and multiply up to derive the final join selectivity. (And then wait for the trap that 10g introduces with its sanity checks.)

Want to know how to edit a custom ring tone Edit the contact entry as shown previously, glide to the Custom Ring Tone field, and click the trackpad. Just select any other tone for the contact.

Consider the following extract (see join_card_04.sql in the online code suite): create table t1 as select trunc(dbms_random.value(0, 30 )) trunc(dbms_random.value(0, 50 )) lpad(rownum,10) rpad('x',100) from all_objects where rownum <= 10000 ; create table t2 as select trunc(dbms_random.value(0, 40 )) trunc(dbms_random.value(0, 40 )) lpad(rownum,10) rpad('x',100) from all_objects where rownum <= 10000 ; -select from

C++/CLI supports templates on managed types, generally known as managed templates. Managed templates differ from generics in several ways, although the syntax is very similar and both are parameterized types. The main difference is the templates are resolved at compile time, and so are considered to be fully specified types by the runtime, whereas generics remain generic at runtime as well. Another way of putting this is that for templates, the parameterization is handled by the compiler, whereas with generics, the parameterization is handled by the runtime. In this section, you ll see the implications of this difference in some detail, but before you get too far into the comparison of managed templates and generics, let s look at the basics of using templates on managed types. The first example, Listing 11-23, shows a simple template class that is a ref class. Note the syntax that puts the template keyword first, followed by the template argument list, then any attributes, if any, and then the ref class keyword. Let s put the managed template declaration in a header file. The class template declares a member object and exposes it through a property, InnerObject, that in this simple example behaves just like a trivial property, but allows you to see how you use the type parameter in a managed type declaration.

[Type text]

When we run this through autotrace (and 9i and 8i should produce the same cardinality, though the costs may differ), we get the following: Execution Plan (9.2.0.6 autotrace) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=60 Card=50000 Bytes=1700000) 1 0 HASH JOIN (Cost=60 Card=50000 Bytes=1700000) 2 1 TABLE ACCESS (FULL) OF 'T1' (Cost=28 Card=10000 Bytes=170000) 3 1 TABLE ACCESS (FULL) OF 'T2' (Cost=28 Card=10000 Bytes=170000) The cardinalities on t1 and t2 are clearly correct; we haven t filtered out any rows on the tablescans. Consequently, our join cardinality of 50,000 must come from 100,000,000 (i.e., 10,000 * 10,000) times a join selectivity of 1/2,000 but where in our data definitions can we find that magic 2,000

Sometimes, it is easy to forget that your BlackBerry is first and foremost a phone, and a very capable phone at that. You have many extra phone features on your phone as well as the ability to use voice dialing to place your calls (see Figure 10-1). In this chapter, we will show you how to place calls, answer calls, mute calls, use voice dialing, and use your call log. We will also show you how to set up and use speed dial on your BlackBerry.