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are no rows in table t1 that do not have a corresponding row in table t2 despite the fact that we ve clearly just reported one. The problem is that there is a row in table t2 where n1 is null as soon as this occurs, the final query can never return any data because every row from table t1 that is tested gets to this null row and tests the condition t1.n1 = null (which is not the same as t1.n1 is null), which never returns true. The solution, of course, is to include a not null predicate at both ends of the test: select from where and * t1 t1.n1 is not null t1.n1 not in ( select t2.n1 from t2 where t2.n1 is not null )

There may be some situations where you want a combination of options that one profile alone cannot satisfy. The BlackBerry is highly customizable so that you can adjust your profile options for virtually any potential situation. The easiest way to accomplish this is to choose a profile that is closest to what you need and edit it, as shown here. To enter the Advanced Profile menu, do the following:

; N1 V1 ---------- -------------------99 Ninety-nine 1 row selected. Because of the problem of comparisons with null, the optimizer is only able to transform the standard not in subquery if the not null predicates or constraints are in place. Otherwise, the only possible execution plan is the filter option; moreover, the clever optimization that we saw for the filter option is not (currently) implemented for the case where the filter is there to deal with a not in. This is another reason for defining database constraints. If you know that a column should never be null, then tell the database about it, otherwise bad data (in the form of a null) may get into that column one day, and make any existing not in subqueries suddenly return the wrong answer for no apparent reason. Just to complete the catalog, you might note that the (apparently opposite) expression colX in ('A', 'B', 'C') is equivalent to colX = 'A' or colX = 'B' or colX = 'C' The string of ORs means that just one of the individual tests in the list needs evaluate to true (after which Oracle need check no further) for the entire expression to evaluate to true. Apart from the benefit of being able to take a shortcut on the test, this does mean that the presence of a null somewhere in the test is not a problem. This shows us that, counterintuitively, the two operators in and not in are not exact opposites of each other.

StringWriter and StringReader provide support for writing and reading strings using the same interfaces used for writing to streams and files. The use of this class is straightforward, as demonstrated in Listing 5-15, which uses some of my wife s poetry, this one inspired by Seattle s Pike Place market. Listing 5-15. Writing Poetry with StringWriter // stringwriter.cpp // The Windows Forms namespace lives in a different // assembly, which is not referenced by default as is // mscorlib.dll, so we must use #using here. #using "System.Windows.Forms.dll" using using using using namespace namespace namespace namespace System; System::IO; System::Text; System::Windows::Forms;

1. 2.

As the optimizer becomes increasingly clever with subqueries, you may find that code that used to work efficiently suddenly starts to misbehave because you ve told it to! Hints even the

Click the Profiles icon as you did previously. (Or press the hotkey letter F from your Home screen.) Scroll down to Advanced and click.

simplest ones can be very dangerous, and here s an example showing how things can go badly wrong (see script ordered.sql in the online code suite). It starts with a query that needed a little bit of hinting in 8i to make the join between t1 and t3 take place in the right order: select /*+ ordered push_subq */ t1.v1 from t1, t3 where and t3.n1 = t1.n1 exists ( select from where and ) exists ( select from where and )

int main() { StringWriter^ sw = gcnew StringWriter(); sw->WriteLine("Pike Place"); sw->WriteLine("Street of Dreams"); sw->WriteLine("(C) 2006 Jeni Hogenson"); sw->WriteLine(); sw->Write("Walking with bare feet\n"); sw->Write("Seattle streets, gospel beat,\n"); sw->Write("She's got magic\n"); sw->WriteLine(); sw->WriteLine("Bag of black upon her back\n" + "A sensual blend, soul food that is;\n" + "Local color."); sw->WriteLine(); String^ jambo = "jambo"; String^ s = String::Format("Open the bag, {0}, {1}.", jambo, jambo); sw->WriteLine(s); sw->Write("Make a wish, {0}, {0}.", jambo); sw->WriteLine();

Each of the profiles can be adjusted by scrolling to the profile you desire to edit, pressing the Menu key, and selecting Edit.