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C.customeridor an aggregate function, such as COUNT(O.orderid). The reasoning behind this limitation is that a single row in the final result set will eventually be generated for each group (unless filtered out). Examine VT5 in Table 1-9, and think what the query should return for customer FRNDO if the SELECT list you specified had been SELECT C.customerid, O.orderid. There are two different orderid values in the group; therefore, the answer is nondeterministic. SQL doesn't allow such a request. On the other hand, if you specify: SELECT C.customerid, COUNT(O.orderid) AS numorders, the answer for FRNDO is deterministic: it's 2.

8, @leftempid = NULL, @rightempid = NULL, 8, @leftempid = 8, @leftempid = 8, @leftempid = 8, @leftempid = 8, @leftempid = 8, @leftempid = 8, @leftempid = 8, @leftempid = 8, @leftempid = 8, @leftempid = 8, @leftempid = 8, @leftempid = 9, @rightempid = NULL, 9, @rightempid = 11, @rightempid = 11, @rightempid = 13, @rightempid = 13, @rightempid = 15, @rightempid = 15, @rightempid = 17, @rightempid = 17, @rightempid = 19, @rightempid = 19, @rightempid = 10, 10, 12, 12, 14, 14, 16, 16, 18, 18, 20,

// Initialize the CollectionView for the underlying model // and track the current selection. Customers = new PagedCollectionView(customers); Customers.CurrentChanged += new EventHandler(SelectedItemChanged); } private void SelectedItemChanged(object sender, EventArgs e) { Customer current = Customers.CurrentItem as Customer; ... } }

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Remember that the wait information in the DMV is cumulative. To get the waits that took place within each interval, you need to apply a self-join between two instances of the table one representing the current samples and the other representing the previous samples. The join condition will match each current row to the row representing the previous sampling for the same wait type. Then you can subtract the cumulative wait time of the previous sampling from the current, thus producing the wait time during the interval. The following code creates the IntervalWaits function, which implements this logic:

holidays, and other special events as nonworking days, you might want to use an auxiliary table of dates . You mark each date as working or nonworking, and when requested to calculate the number of working days, you count the rows representing working days between the two given dates . You can even optimize the solution by keeping an attribute with a cumulative count of working days as of some base date . To calculate working days, simply retrieve the cumulative values of the given input dates and subtract one from another . However, when you want to consider only weekends as nonworking days, you don t need an auxiliary table at all . Instead, here s a solution for calculating the number of working days between @s and @e, which can be local variables or input arguments of a routine:

In the old days, when the Oracle DBMS didn t yet support referential integrity constraints (which is a long time ago, before Oracle7), you were still able to implement certain integrity constraints by using WITH CHECK OPTION when creating views. For example, you could use subqueries in the view definition to check for row existence in other tables. Listing 10-18 gives an example of such a view. Nowadays, you don t need this technique anymore, of course. Listing 10-18. WITH CHECK OPTION and Constraint Checking SQL> 2 3 4 5 6 7 create select from where and or replace view reg_view as r.* registrations r r.attendee in (select empno from employees) r.course in (select code from courses)

C# and Java both define weak references. If the only reference to an object is a weak reference, the object can be collected as garbage. Weak references are useful for referencing data that can easily be re-created and that should be freed if there is pressure for memory. Weak references are frequently used for cached data, where there is a performance improvement when the data is read from the cache but the data can be re-created if the cached information is collected. The System.WeakReference class is used to create a weak reference. A weak reference is said to track an object, which is to say, maintain a weak association. There are two forms of weak reference, short-lived and long-lived. The difference is that long-lived weak references

.NET 2.0 ships with a comprehensive management API for reading, editing, and creating web.config file settings. The root class for programmatic access to the configuration infrastructure is Configuration. Using the static methods of this class, you can access the machine.config file and any web.config file defined in the context of the application. Table 12-1 lists these static methods.

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