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It is possible to return a table as the data type from a function. The table data type can hold multiple columns and multiple rows of data as you would expect, and this is one of the main ways it differs from other data types, such as varchar, int, etc. Returning a table of data from a function allows the code invoking the function the flexibility to work with returned data as if the table permanently existed or was built as a temporary table. To supply extensibility to this type of function, SQL Server provides you with an operator called APPLY, which works with a table-valued function and joins data from the calling table(s) to the data returned from the function. The function will sit on the right-hand side of the query expression, and through the use of APPLY can return data as if you had a RIGHT OUTER JOIN or a LEFT OUTER JOIN on a permanent table. Before you see an example, you need to be aware that there are two types of APPLY: a CROSS APPLY and an OUTER APPLY. CROSS APPLY: Returns only the rows that are contained within the outer table where the row produces a result set from the table-valued function. OUTER APPLY: Returns the rows from the outer table and the table-valued function whether a join exists or not. This is similar to an OUTER JOIN, which you saw in 11. If no row exists in the table-valued function, then you will see a NULL value in the columns from that function.

SUBSTRING()

EXECUTE AS login = 'sqllogin1' SELECT ProductCategoryID, Name FROM Production.ProductCategory GO SELECT COUNT(*) FROM Production.ProductSubcategory GO REVERT GO

In our example, we will build a table-valued function that accepts a CustomerId as an input parameter and returns a table of TransactionDetails.Transactions rows. CREATE FUNCTION TransactionDetails.ReturnTransactions (@CustId bigint) RETURNS @Trans TABLE (TransactionId bigint, CustomerId bigint, TransactionDescription nvarchar(30), DateEntered datetime, Amount money) AS BEGIN INSERT INTO @Trans SELECT TransactionId, CustomerId, TransactionDescription, DateEntered, Amount FROM TransactionDetails.Transactions t JOIN TransactionDetails.TransactionTypes tt ON tt.TransactionTypeId = t.TransactionType WHERE CustomerId = @CustId RETURN END

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As you have seen, you can take a number of characters from the left and from the right of a string. To retrieve a number of characters that do not start with the first or last character, you need to use the function SUBSTRING(). This has three parameters: the variable or column, which character to start the retrieval from, and the number of characters to return.

Instead of choosing to use either fixed roles or the assignment of individual permissions to principals, you can choose to rely on a combination of the two approaches to managing security For example, a fixed role may have most of the permissions that you need a principal to have However, the fixed role may also have permissions that you do not want the principal to have, and the fixed role can concurrently fail to have other permissions that you want the principal to have In this kind of scenario, you can do the following: Assign a principal to a fixed role as a starting point for the principal s security settings Specify DENY statements for permissions that you do not want a principal to have but that are provided by the fixed role Add permission that the fixed role does not provide through one or more GRANT statements.

Now that we have the table-valued function built, we can call it and use CROSS APPLY to return only the Customer rows where there is a customer number within the table from the table-valued function. The following code demonstrates this: SELECT c.CustomerFirstName, CustomerLastName, Trans.TransactionId,TransactionDescription, DateEntered,Amount FROM CustomerDetails.Customers AS c CROSS APPLY TransactionDetails.ReturnTransactions(c.CustomerId) AS Trans The results from the preceding code are shown in Figure 12-1, where you can see that only rows from the CustomerDetails.Customers table are displayed where there is a corresponding row in the TransactionDetails.Transactions table.

Use one or more REVOKE statements to retire obsolete individual security settings that were previously made with GRANT and DENY statements This section illustrates techniques for implementing a fine-tuning strategy for designing the security settings for a principal You can find the code for this section in PermissionsAndRolessql The sample for the section modifies the settings of a principal that belongs to both the db_datareader and db_datawriter fixed database roles These two fixed roles convey the right to invoke a SELECT statement as well as to run INSERT, UPDATE, and DELETE statements for any object in a database The principal is the cab233a\winlogin1 user in the NewDB1 database associated with the cab233a\winlogin1 login The code for creating the NewDB1 database initially appears in the Enabling a Login to Create a Database section.

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