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0 or 1 to show whether a column has an IDENTITY property setting (a value of 1 indicates a column with an IDENTITY property setting). Other meta data that could be added to the result set include such items as precision and scale of numbers in a column and whether the column is nullable or computed. Column ------------SalesPersonID FirstName MiddleName LastName Phone EmailAddress data type --------int nvarchar nvarchar nvarchar nvarchar nvarchar max_length ---------4 100 100 100 50 100 is_identity ----------0 0 0 0 0 0

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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User-defined functions allow you to return the outcome of a scalar value such as the result of numerical or string calculation or a result set User-defined functions can be programmed with T-SQL code, and they are database objects Therefore, you can create, drop, and alter them Unlike a view, a user-defined function can accept one or more input parameters, which enables users to change the output from a user-defined function at runtime There are three types of user-defined functions These types depend in part on what a userdefined function can return As mentioned, a user-defined function can return the output of a computation as a scalar value or it can return a result set as a table data type A scalar user-defined function (FN) returns a single value, such as an int value or an nvarchar value.

The next section demonstrates a different method of backing up the structure of the database and the tables and indexes contained within it by using T-SQL commands to complete this.

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.

You can use an FN user-defined function to process numbers or characters, such as converting a temperature from centigrade to Fahrenheit or combining the parts of a name into a full name Two types of user-defined functions return a table value A table value can contain one or more rows of column values An inline user-defined function (IF) returns the output from a single SELECT statement The structure of the returned table value automatically conforms to the structure of the columns in the result set You cannot edit the values of a SELECT statement s result set from within an IF user-defined function A multi-statement table-valued user-defined function (TF) also returns a table value However, a TF user-defined function requires you to declare the column values within the function, generate values for the table, and insert values in the returned table.

Note It is only the structure that will be generated as T-SQL commands; no data will be backed up only

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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