c# barcode generator source code BUILDING A VIEW in Font

Make PDF 417 in Font BUILDING A VIEW

CHAPTER 9 BUILDING A VIEW
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Figure 9-5. Our view with the columns selected 7. We are going to change the details in the column grid now to enforce sorting criteria and to give the column aliases. This means that if a user just does SELECT * from the view, then he or she will receive the data in the order defined by the view s query by default. It also means that some of the column names will have been altered from those of the underlying table. We want to ensure that the shares come out from the view in ascending name order. Move to the Sort Type column and click in the row that corresponds to ShareDesc. Select Ascending, as shown in Figure 9-6.
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Figure 9-6. Placing an order on the data 8. In the next column, Sort Order, if we were defining more than one column to sort, we would define the order to sort the columns in. Select the value 1 in this value. However, we still need to add the aliases, which are found in the second column of the grid. Notice the third column, CurrentPrice. To make this column more user friendly, we make the name Latest Price, with a space. When we type this and tab out of the column, it becomes [Latest Price], as you see in Figure 9-7; SQL Server places the square brackets around the name for us because of the space.
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Figure 9-7. Alias with identifier
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CH AP T ER 9 BUI LD I NG A VI EW
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9. Scrolling to the right of the screen would allow us to define a filter for the view as well. This is ideal if we want to restrict what a user can see. Although sort orders can be changed by the T-SQL that calls the view, filters placed within the view cannot return more data than the view allows. So going back to our salary example mentioned earlier, this would be where we would restrict users to not seeing the MD s salary. In our example, we will only list those shares that have a current price in other words, where CurrentPrice is greater than 0, as shown in Figure 9-8.
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Figure 9-8. Filtering the data 10. Notice the Query Editor pane, which now has the filter within it as well as the sorting order. Also take a look at the diagram pane and how the table display has been altered, as you see in Figure 9-9.
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Figure 9-9. The table with the view options applied 11. Moving back to the T-SQL in the SQL pane, what about the TOP (100) PERCENT clause Where did that come from First of all, if you specify an order in a view, then by default SQL Server will place the TOP (100) PERCENT clause within the SQL, just as you saw in 8. It can be used if the table is very large and you don t want to allow users to return all the data on a production system, as it would tie up resources. You can also remove that clause from the Query Editor pane if you want; this will unlink your query from the designer and the Properties window, but you would also need to remove the ORDER BY. The ORDER BY is only here for the TOP clause, and the data can be returned after the TOP number has been chosen by SQL Server in random order. If the user of the view required a specific order, then an ORDER BY would be required when using the view. A final point to notice is how the column aliases are defined. The physical column is named followed by AS and then the alias.
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