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You may have noticed that most phone numbers you see are underlined on your BlackBerry. This allows you to place a call to any underlined number you see (Figure 102). This works anywhere, in an e-mail signature, calendar event, MemoPad item, or even a web browser screen.

Join Selectivity = (1000 / 1000) * (1000 / 1000) / greater(30, 40) = 1/40 = 0025 Since the filter condition is the same (one value in 100) on each of the tables, the join cardinality is going to come out the same, whichever table has the filter applied: Join Cardinality = Join Selectivity * filtered cardinality(t1) * filtered cardinality(t2) = 0025 * 10 * 1000 = 250 So here are the two execution plans: Execution Plan (9206 Filter on just T1) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=11 Card=250 Bytes=7750) 1 0 HASH JOIN (Cost=11 Card=250 Bytes=7750) 2 1 TABLE ACCESS (FULL) OF 'T1' (Cost=5 Card=10 Bytes=170) 3 1 TABLE ACCESS (FULL) OF 'T2' (Cost=5 Card=1000 Bytes=14000) Execution Plan (920.

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.

There may be times when you are having trouble hearing a caller. The connection may be bad (because of their old fashioned phone, e.g., a non-BlackBerry) or you may be using a headset. Adjusting the volume is easy. While on the phone call, simply use the two volume keys on the right-hand side of the BlackBerry to adjust the volume up or down.

6 Filter on just T2) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=11 Card=333 Bytes=10323) 1 0 HASH JOIN (Cost=11 Card=333 Bytes=10323) 2 1 TABLE ACCESS (FULL) OF 'T2' (Cost=5 Card=10 Bytes=170) 3 1 TABLE ACCESS (FULL) OF 'T1' (Cost=5 Card=1000 Bytes=14000) Change the filter table, and you change the cardinality of the result Filtering on table t1, we get a cardinality of 250, as we inferred from the formula Filter on table t2, and the cardinality changes to 333 Can you guess where that came from Is it a coincidence that 1,000 / 30 = 333 One simple variation on the join cost algorithm appears when there is a filter predicate at just one end of the join we may use the num_distinct values from the table at the other end of the join, not the greater of the two num_distinct.

There are times you want to be able to mute yourself on the call. It might be so you can discuss something in private or you just want to be quiet as you listen to a conference call. To

(And I suspect that this statement is probably just a very special case of a more general rule about how filter predicates may affect the way that the optimizer decides which table to use as the source of num_distinct) When we have a filter only on t2, we use the num_distinct of 30 from table t1, rather than the larger num_distinct of 40 required by the standard formula..

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.