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Many times so far, you have seen NULL values within a column of returned data. As a value, NULL is very useful, as you have seen. However, you may wish to test whether a column contains a NULL or not. If there were a value, you would retain it, but if there were a NULL, you would convert it to a value. This function could be used to cover a NULL value in an aggregation, for example. The syntax is ISNULL(value_to_test,new_value) where the first parameter is the column or variable to test if there is a NULL value, and the second option defines what to change the value to if there is a NULL value. This change only occurs in the results and doesn t change the underlying data that the value came from.

to be ranked in the order required, and then that value can be used for splitting the data into further groupings. There are four ranking functions, which will be discussed in detail in upcoming sections: ROW_NUMBER: Allows you to provide sequential integer values to the result rows of a query. RANK: Provides an ascending, nonunique ranking number to a set of rows, giving the same number to a row of the same value as another. Numbers are skipped for the number of rows that have the same value. DENSE_RANK: Similar to RANK, but each row number returned will be one greater than the previous setting, no matter how many rows are the same. NTILE: Takes the rows from the query and places them into an equal (or as close to equal as possible) number of specified numbered groups, where NTILE returns the group number the row belongs to.

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The second GRANT statement enables permission to run a SELECT statement against the ProductSubcategory table The third GRANT statement confers permission to run the ProcHello stored procedure with an EXEC statement The permissions designated by the three GRANT statements are assigned to various subsets of the three custom database roles The first GRANT statement with SELECT permission for the ProductCategory table assigns its permission to all three custom roles The second GRANT statement with SELECT permission for the ProductSubcategory table assigns its permission to the ReadCatsSubCats and SayHello roles The third GRANT statement confers EXEC permission for the ProcHello stored procedure to just one role SayHello GRANT SELECT ON ProductionProductCategory TO ReadCats, ReadCatsSubCats, SayHello GRANT SELECT ON ProductionProductSubcategory TO ReadCatsSubCats, SayHello GRANT EXEC ON dboProcHello TO SayHello The setup for the demonstration of custom database roles includes two more kinds of steps.

Try It Out: ISNULL()

First, the script creates three logins and matching AdventureWorks users named sqllogin3, sqllogin4, and sqllogin5 Again, to conserve space, the code for creating the logins and users is not included in this book, but it is available in UsersRolesPermissionssql See the Creating Principals section for a review of the process for creating logins and users if you want to review the topic..

Note These ranking functions can only be used with the SELECT and ORDER BY statements. (Sadly, they

1. In this example, we define a char() variable of ten characters in length and then set the value explicitly to NULL. The example will also work without the second line of code, which is simply there for clarity. The third line tests the variable, and as it is NULL, it changes it to a date. Note, though, that a date is more than ten characters, so the value is truncated. DECLARE @IsNull char(10) SET @IsNull = NULL SELECT ISNULL(@IsNull,GETDATE()) 2. As expected, when you execute the code, you get the first ten characters of the relevant date, as shown in Figure 11-42.

Second, the script assigns the new database users to the custom database roles Each new user gets assigned to one of the three custom roles with the sp_addrolemember system-stored procedure EXEC sp_addrolemember 'ReadCats', 'sqllogin3' EXEC sp_addrolemember 'ReadCatsSubCats', 'sqllogin4' EXEC sp_addrolemember 'SayHello', 'sqllogin5' This kind of basic security design is actually quite common in database solutions It contains three levels of security, represented by three roles Each role can confer at least one permission to its members One role, SayHello, is analogous to an administrator because its members have all possible permissions This kind of role typically has one or just a very few members Another role, ReadCatsSubCats, conveys a subset of the full set of permissions to its members The number of members of this role is typically greater than those in the first role.

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