BUILDING A VIEW in Visual C#

Printer Data Matrix in Visual C# BUILDING A VIEW

CHAPTER 9 BUILDING A VIEW
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Figure 9-10. The properties of a view
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Figure 9-11. Populated properties of a view
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CHAPTER 9 BUILDING A VIEW
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14. We think the view is complete, but we need to test it out. By executing the query with the execute button (the one sporting the red exclamation point) we will see the results in the results pane. 15. Now that the view is complete, it is time to save it to the database. Clicking the close button will bring up a dialog box asking whether you want to save the view. Click Yes to bring up a dialog box in which you give the view a name. You may find while starting out that there is a benefit to prefixing the name of the view with something like vw_ so that you know when looking at the object that it s a view. Many organizations do use this naming standard; however, it is not compulsory, and SQL Server Management Studio makes it clear what each object is. The naming standard comes from a time when tools did not make it clear what object belonged to which group of object types. Once you have the name you wish, as shown in Figure 9-12, click OK.
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Figure 9-12. Naming the view 16. This will bring us back to SQL Server Management Studio, where we will see the view saved (see Figure 9-13).
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Figure 9-13. Finding a view in Object Explorer We have now created our first view on the database. However, this method of building a view could be seen as a bit slow and cumbersome for something so simple. What if we wanted to combine two tables, or a view and another table
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Creating a View Using a View
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Creating a view that uses another view is as straightforward as building a view with a table. The downside of building a view with a view is that it cannot be indexed for faster execution. Therefore, depending on what the T-SQL of the final view is, data retrieval may not be as fast as it could be with an index. Also, by having a view within a view, you are adding increased complexity when debugging or profiling performance. Therefore, consider including the T-SQL from the selected view in this new view.
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CHAPTER 9 BUILDING A VIEW
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In this example, we will build a view of share prices using the vw_Shares view created previously. In reality, we would use the ShareDetails.Shares table along with ShareDetails. SharesPrices for the reasons just discussed.
Try It Out: Creating a View with a View
1. From SQL Server Management Studio Object Explorer, find Views, right-click, and select New View. The Add Table dialog box comes up as before (see Figure 9-14). From the Table tab, select SharePrices(ShareDetails).
Figure 9-14. Add a table 2. Move to the Views tab; there should only be one view, shown in Figure 9-15, as that is all we have created. Select the view, click Add, and then click Close.
Figure 9-15. Adding a view
CHAPTER 9 BUILDING A VIEW
3. The View Designer will now look similar to Figure 9-16, with two tables and the SQL showing a new type of join, a CROSS JOIN.
Note A CROSS JOIN will take every row in one table and join it with every row in the second table. We
look at these in 12.
Figure 9-16. With more than one object, how the basic view looks 4. We want to place an INNER JOIN between the table and the view where for each share we get all the share prices only. At this moment in time we cannot do this, as vw_Shares does not have a share ID column. We therefore have to modify the vw_Shares view. Keep what you have built in the View Designer, and move back to the Object Explorer. Find vw_Shares, right-click, and this time select Modify as shown in Figure 9-17.
Figure 9-17. Modifying a view for a join 5. From the View Designer, click the ShareId column, as shown in Figure 9-18. This will then include the ShareId column in the view as the last column. You can use the criteria pane to move this column if you wish.
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