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PIVOT ( SUM(so.LineTotal) FOR so.ProductID IN ([776], [711], [747]) ) AS pt ORDER BY pt.Discount UNPIVOT has similarities to PIVOT in that you build a CTE in this case calling it upl which you then use as the basis of unpivoting. Once the CTE is defined, you then use UNPIVOT with the column definitions of the columns to create, DiscountAppl and ProductID where using IN defines the rows that will be produced back from the UNPIVOT. SELECT ProductID,Discount, DiscountAppl FROM (SELECT Discount, product711, Product747, Product776 FROM #Temp1) up1 UNPIVOT ( DiscountAppl FOR ProductID IN (Product711, Product747, Product776)) As upv2 WHERE DiscountAppl <> 0 ORDER BY ProductID When the preceding code is executed, the data is unpivoted, as shown in Figure 12-5.

4. This time when you run the code, you see a value of 1, as shown in Figure 11-41, denoting a valid entry.

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Instead of using fixed database roles you can create your own custom roles. A custom role is a database object that serves as a principal. Custom database roles are similar to fixed database roles in that you can add and drop users from membership in either type of role. In fact, you use the same system-stored procedures to add and drop members in fixed database roles as you do for custom database roles. There are two especially important distinctions between fixed and custom database roles. First, fixed database roles cannot be added to or dropped from a database whereas custom database roles can be added and dropped from a database. Use the CREATE ROLE, ALTER ROLE, and DROP ROLE statements to add, modify, and drop a custom database role. Second, permissions associated with a custom role are not fixed. You can configure a role to confer to its members any set of permissions that you want. You can configure the permissions for a custom database role with the same GRANT, DENY, and REVOKE statements that you use to manage permissions for a user. Just designate a role name instead of a user name in the TO clause of the statement.

Figure 12-5. Unpivotted data results Now that we have pivoted data, we can take a look at how we can rank output.

The sample for demonstrating the use of custom roles uses three custom roles, three permissions, and three users The roles and users are added to the AdventureWorks database Two permissions include SELECT permission for the ProductCategory and ProductSubcategory tables in the Production schema The sample adds a new stored procedure, named ProcHello, which uses the PRINT statement to return the string with a value of Hello from ProcHello The third permission grants EXEC permission for ProcHello The script in UsersRolesPermissionssql starts by setting the database context to the AdventureWorks database and adding ProcHello to the database with a CREATE PROC statement The code for these steps does not appear in the book to conserve space, but the code is available at the top of UsersRolesPermissionssql If you want a reminder about how to use the CREATE PROC statement, see the Creating and Using Stored Procedures section in 7.

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With SQL Server 2005, it s now possible to rank rows of data in your T-SQL code. Ranking functions give you the ability to rank each row of data to provide a method of organizing the output in an ascending sequence. You can give each row a unique number or each group of similar rows the same number. You may be wondering what is wrong with other methods of ranking data, which might include IDENTITY columns. These types of columns do provide unique numbers, but gaps can form. You are also tied in to each row having its own number when you may wish to group rows together. So then, why not GROUP BY Well, yes, you can use GROUP BY, but what if the grouping was over more than one column In this case, processing the data further would require knowledge about those columns. Ranking functions make it possible to provide a value that allows data

After setting up the sample by completing the two preceding steps, the sample creates three custom database roles called ReadCats, ReadCatsSubCats, and SayHello Each database role has its own CREATE ROLE statement The CREATE ROLE statement requires one argument, which is the name of the custom role, and allows an optional second argument for its AUTHORIZATION clause The argument for the AUTHORIZATION clause designates a user or role to serve as the owner of the new custom role If you do not specify an AUTHORIZATION clause in a CREATE ROLE statement, the principal invoking the statement is the owner of the custom role CREATE ROLE ReadCats CREATE ROLE ReadCatsSubCats CREATE ROLE SayHello Next, three GRANT statements assign permissions to the roles The first GRANT statement conveys permission to perform a SELECT statement with the ProductCategory table as a data source.

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