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SqlServer allows you to do so.
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criteria_range: this column contains the search criterion . If the search criterion is contained in one row within this column, this is one of the rows that will be included in the total .
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In addition to the XML features presented in Table 16-14, a DataSet can be synchronized with an XmlDataDocument. The utility of this relationship stems from the XmlDataDocument support for Document Object Model (DOM) manipulation as well as XPath queries and XSL Transformations. This provides both relational and hierarchical access to the same underlying data. Changes made through either the DataSet or the XmlDataDocument are immediately reflected in the corresponding view. To synchronize a DataSet with an XmlDataDocument, pass the DataSet instance as an argument to the XmlDataDocument constructor. For example:
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If a column (in a specific row of a table) contains no value, we say that such a column contains a null value. The term null value is actually slightly misleading, because it is an indicator of missing information. Null marker would have been a better term, because a null value is not a value. There can be many different reasons for missing information. Sometimes, an attribute is inapplicable; for example, only sales representatives are eligible for commission. An attribute value can also be unknown; for example, the person entering data did not know certain values when the data was entered. And, sometimes, you don t know whether an attribute is applicable or inapplicable; for example, if you don t know the job of a specific employee, you don t know whether a commission value is applicable. The REGISTRATIONS table provides another good example. A null value in the EVALUATION column can mean several things: the course did not yet take place, the attendee had no opinion, the attendee refused to provide her opinion, the evaluation forms are not yet processed, and so on. It would be nice if you could represent the reason why information is missing, but SQL supports only one null value, and according to Ted Codd s rule 3 (see 1) null values can have only one context-independent meaning.
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See "Exceptions and Exception Handling" in 6 for details of the try statement.
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user s state informa tion. For more informa tion about this topic, see the sidebar ASP.N ET Forms vs. Visual Basic 6.0 Forms, earlier in this chapter . Wow. That s a lot of code! Not surprisingly, the C# script block at the top of Listing 5-1 isn t present in Listing 5-2, since it is identified as a runat=server script block. However, there is a new <SCRIPT> block, as follows: <script language="javascript" src="/aspnet_client/system_web/1_0_3217_0/WebUIValidation.js"> </script> This code, of course, doesn t look even a little familiar! Looking at the Internet Information Services console, we can see that, sure enough, a directory is logically located where the src attribute on the <SCRIPT> tag points to, as shown in Figure 5-5.
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A synchronized (thread-safe) implementation of a concrete collection can be obtained by calling the Synchronized method, which returns a wrapped version of the collection, just like calling java.util.Collections.synchronizedCollection. This wrapped version is thread safe and can be used by concurrent writers. In addition, the ICollection interface provides a method to determine whether a collection is synchronized, and it provides an object that can be used for locking when writing thread-safe wrappers or using monitors.
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For each such period, you need to return the starting date, ending date, duration in days, and the peak (maximum) price. Let s start with a solution that does not use row numbers. The rst step here is to lter only the rows where the price is greater than or equal to 50. Unlike the traditional problem where you really have gaps in the data, here the gaps appear only after ltering. The whole sequence still appears in the Stocks table. You can use this fact to your advantage. Of course, you could take the long route of calculating the maximum date within the group (the rst date that is both later than or equal to the current date and followed by a gap). However, a much simpler and faster technique to calculate the grouping factor would be to return the rst date that is greater than the current, on which the stock s price is less than 50. Here, you still get the same grouping factor for all elements of the same target group, yet you need only one nesting level of subqueries instead of two. Here s the query:
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LISTING 12-3 Data de nition language and sample data for the Cities and Roads tables
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Click Administration Links to open the Manage Administration Links page. Links added here are only visible to users with either Network Administration or Standard User With Administration Links roles. Click Customization in the left pane to open the Customize Link List Section Names page, shown in Figure 19-32. The only change you can make here is to change the names of the two sets of links.
As you can see, the CLR version of the function is dozens of times faster than the T-SQL version . As I mentioned earlier, the SQLSigCLR function implements the same algorithm implemented by the SQLSigTSQL function and is provided mainly for purposes of performance comparison . You can implement a much more powerful CLR-based solution using regular expressions . Earlier I explained how you can perform string replacement and parsing based on regular expressions . I provided an implementation of a function called RegexReplace that invokes the Regex.Replace method . Here s an example of how you can use the function to generate query signatures out of the query strings stored in the Queries table:
FIGURE 15-20 Fetch XML as shown on the Modify Query Variables tab of the Define Query page
A. LayoutEditorPart B. EditorZone c. CatalogZone D. AppearanceEditorPart
Because contact information resides in a standard Windows Explorer folder, you can use standard Windows Explorer methods to organize your folder store and customize its display. For example, you can create subfolders for business, personal, and family contacts, and use them to segregate your contact entries. As long as a contact is stored in a subfolder of Contacts (or in Contacts itself), Windows Mail will find the information it needs when you address an e-mail message to that contact. All the standard Windows Explorer viewing options are available in your Contacts folder and subfolders, so you can switch easily between iconic and tabular display styles. If you have assigned a picture to a contact (by clicking on the picture frame in the Name And E-Mail tab of the contact s properties dialog box and supplying the name of a picture file), that picture will appear in the various iconic displays. If you ve enabled the Preview Pane (choose Organize on the Command Bar, then Layout, Preview Pane), you can read most of the essential details about any contact simply by highlighting the contact s entry; that is, you can save yourself the trouble of opening the contact s properties dialog box.
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