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If we think about applying the selectivity formula twice, we ll soon spot it. The critical component in our case is the bit that goes greater(num_distinct(t1.c1), num_distinct(t2.c2)) We have two join components, t1.join1 = t2.join1 and t1.join2 = t2.join2. In 3 you learned that you combine selectivities on single tables by multiplying them together (at least, that s what you do when the individual predicates have an and between them). You do exactly the same with the join selectivities: Join Selectivity = {join1 bit} * {join2 bit} = (10,000 - 0) / 10,000) * (10,000 - 0) / 10,000) / greater(30, 40) * (10,000 - 0) / 10,000) * (10,000 - 0) / 10,000) / greater(50, 40) = 1/40 * 1/50 = 1/2000

// Shallow copy creates another name for the array. array<int>^ array2 = array1; array2[0] = 100; // This prints "100" since array2 is a synonym of array1. Console::WriteLine( "{0}", array1[0] ); array<int>^ array3 = gcnew array<int>(3); Array::Copy(array1, array3, array1->Length); // Change a value in the new copy of the array. array3[0] = 200; // This prints "100 1 2" since the old array was not affected. Console::WriteLine( "{0} {1} {2}", array1[0], array1[1], array1[2]); } Here is the output of Listing 5-30: 100 100 1 2

Press the Green Phone key at any time to get into the Phone application. Just start dialing numbers. First, the BlackBerry will try to match the letters you are typing to address book entries. If it cannot find any, then it will just show you the digits you have typed, as shown. You will notice that a small image of the Green Phone key is immediately after the cursor. Once all the numbers are punched in, just press the Green Phone key and the call will be placed.

-- uses the t2 selectivity (1/40)

-- uses the t1 selectivity (1/50)

Answering a call couldn t be easier. When your call comes in, the number will be displayed on the screen. If you have that particular number already in your address book, the name and/or picture will also be on the screen (if you have entered that information into that particular contact.)

A managed array is actually an instance of the class System::Array. System::Array inherits from System::Object and implements IList. All managed arrays have the members shown in Tables 5-2 and 5-3.

(as required)

When a call comes in, do the following: Press either the Green Phone key or click the trackpad to answer the call. If you are using a Bluetooth headset, you can usually click a button on the headset to answer the call see page 22.

So all we ve done is examine each part of the join in turn, and use the most selective value in each case even if it means the selectivity comes from a different table at each step of the calculation.

The easiest way to call voice mail is to press and hold the number 1 key. This is the default key for voice mail. If it is not working correctly, then please call your phone company technical support for help in correcting it. To set up voice mail, just call it and follow the prompts to enter your name, greeting, password, and other information.

Returns the number of elements in all the dimensions of the array Returns lengths greater than the maximum 32-bit integer, 231 1 Returns the number of dimensions in the array Returns an object which can be used for thread synchronization

Note You may have come across an old bug where the optimizer would fail to notice repeated predicates (for example, add an extra t2.join2 = t1.join2 to the preceding query, and the cardinality would come out at 1,000 instead of 50,000 because the optimizer had done the arithmetic for the join2 columns twice). Various aspects of this problem have been dealt with in 9i.

Sometimes, pressing and holding the 1 key will not dial voice mail. This happens if the voice mail access number is incorrect in your BlackBerry. You will need to call your phone company (wireless carrier) and ask them for your local voice mail access number. This sometimes happens if you move to a different area or change cell phones, then restore all your data onto your BlackBerry. Once you have the new phone number from the carrier, you need to enter it into your BlackBerry. 1. Start your phone by pressing the Green Phone key. Press the Menu key, press the letter O to jump down to the Options item, and select it. Now click Voice Mail.