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can t be used directly in a WHERE or GROUP BY clause, but you can use them in a CTE or derived table.

Finally, a third role, ReadCats, is for any user who has access to the database solution This kind of role typically has substantially more members than either of the other two roles Three EXECUTE AS code blocks complete the main part of the demonstration Each of the three code blocks is the same, except that they are meant for different login principals and their associated user principals The following listing shows the EXECUTE AS code block for the sqllogin3 login As you can see, the code block implements three tasks before reverting control to an execution context that invokes the EXECUTE AS statement The first task is to invoke a SELECT statement for the ProductCategory table The second task is to run another SELECT statement for the ProductSubcategory table The third task is to run the ProcHello stored procedure.

ISNUMERIC()

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WITH OrderedOrders AS (SELECT SalesOrderID, OrderDate, ROW_NUMBER() OVER (order by OrderDate)as RowNumber FROM Sales.SalesOrderHeader ) SELECT * FROM OrderedOrders WHERE RowNumber between 50 and 60; The syntax for ranking functions is shown as follows: <function_name>() OVER([PARTITION BY <partition_by_list>] ORDER BY <order_by_list>) Taking each option as it comes, you can see how this can be placed within a SELECT statement, for example: function_name: Can be one of ROW_NUMBER, RANK, DENSE_RANK, and NTILE OVER: Defines the details of how the ranking should order or split the data PARTITION BY: Details which data the column should use as the basis of the splits ORDER BY: Details of the ordering of the data

Because the sqllogin3 user belongs to the ReadCats role, the sqllogin3 login execution context can only successfully complete the first task to perform a SELECT statement for the ProductCategory table Recall that the ReadCats role receives its sole permission from a single GRANT statement If you use the sqllogin4 login instead, it can successfully perform the first two SELECT statements, but not the third statement, to run the ProcHello stored procedure This is because sqllogin4 belongs to the ReadCatsSubCats role, which receives permissions from two of the three GRANT statements The sqllogin5 login can complete all three statements successfully because sqllogin5 belongs to the SayHello role This custom database role receives permissions from all three GRANT statements EXECUTE AS login = 'sqllogin3' SELECT ProductCategoryID, Name FROM ProductionProductCategory GO SELECT COUNT(*) '# of Subcategories' FROM ProductionProductSubcategory GO EXEC ProcHello GO REVERT GO.

This final system function tests the value within a column or variable and ascertains whether it is numeric or not. The value returned is 0, or false, for an invalid number, or 1 for true if the test is okay and can convert to a numeric.

Our first ranking function, ROW_NUMBER, allows your code to guarantee an ascending sequence of numbers to give each row a unique number. Until now, it has not been possible to guarantee sequencing of numbers, although an IDENTITY-based column could potentially give a sequence providing all INSERTs succeeded and no DELETEs took place.

The script in UsersRolesPermissions.sql concludes with some clean-up code, which follows. This code is interesting for a couple of reasons. First, it allows you to rerun the script successfully multiple times without any manual intervention, except to start the code in the file. This is because the clean-up code removes objects that the code in the main body of the script creates. Failing to run the clean-up code can cause the failure of an attempt to create an object, such as a custom role that already exists. Second, the following code shows the proper order of dropping role members before dropping roles, users, and logins. Other sequences for dropping objects can cause a script failure that may require manual intervention. EXEC sp_droprolemember 'ReadCats', 'sqllogin3' EXEC sp_droprolemember 'ReadCatsSubCats', 'sqllogin4' EXEC sp_droprolemember 'SayHello', 'sqllogin5' DROP ROLE ReadCats DROP ROLE ReadCatsSubCats DROP ROLE SayHello DROP USER sqllogin3 DROP USER sqllogin4 DROP USER sqllogin5 DROP LOGIN sqllogin3 DROP LOGIN sqllogin4 DROP LOGIN sqllogin5 DROP PROCEDURE ProcHello

Try It Out: ISNUMERIC()

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