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Parsing is a process during which the Microsoft SQL Server command parser module first verifies the syntax of a batch. If no errors are found, the command parser breaks the source code into logical units such as keywords, identifiers, and operators. The parser then builds an internal structure that describes the series of steps needed to perform the requested operation or to extract the requested result set from the source data. If the batch contains a query, this internal structure is called a query tree, and if the batch contains a procedure, it is called a sequence tree.

... Insert @tblTerms (TermID, DueDate) Values (@insTerms, Convert(smalldatetime, CASE When @chvLeaseFrequency = 'monthly' ...

Single-Process Architecture SQL Server maintains a single-process, multithreaded architecture that reduces system overhead and memory use. This is called the Symmetric Server Architecture. Native Thread-Level Multiprocessing SQL Server supports multiprocessing at the thread level rather than at the process level, which allows for preemptive operation and dynamic load balancing across multiple CPUs. Using multiple threads is significantly more efficient than using multiple processes.

The Return statement at the end of the function does not specify a value. As soon as it is reached, SQL Server returns the contents of the table variable to the caller:

An in-line table-valued user-defined function is a special type of table-valued user-defined function. Its purpose is to implement parameterized views. The syntax of an in-line table-valued user-defined function is a bit different from the syntax of other functions:

9:

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Create Function [owner_name.]function_name ( [ {@parameter_name scalar_data_type [= default]} [,...n] ] ) Returns Table [With {Encryption|Schemabinding}[,...n] ] [As] | Return (select-stmt)

You do not have to define the format of the return value. It is enough to specify just the table keyword. An in-line table-valued function does not have the body of a function. A resultset is created by a single Select statement in the Return clause. It is best to demonstrate this feature with an example. The following function returns only a segment of a table based on a role the user belongs to. The idea is that a manager or any other employee can see only equipment from his own department:

In this step, a sequence tree is used to generate an execution plan. The optimizer module analyzes the ways that information can be retrieved from the source tables. It attempts to find the fastest way that uses the smallest amount of resources (that is, processing time). It also complements the list of tasks that need to be performed (for instance, it checks security, it verifies that constraints are enforced, and it includes triggers if they need to be incorporated in processing). The result is an internal structure called an execution plan.

Create Function fn_DepartmentEquipment ( @chvUserName sysname ) Returns table As Return ( Select InventoryId, Make + ' ' + model Model, Location From Inventory inner join Contact C On Inventory.OwnerId = C.ContactId Inner Join Contact Manager On C.OrgUnitId = Manager.OrgUnitId Inner Join Equipment On Inventory.EquipmentId = Equipment.EquipmentId Inner Join Location On Inventory.LocationId = Location.LocationId Where Manager.UserName = @chvUserName ) Go

You can use this function in any place where a view or table is allowed, such as in a Select statement:

Figure 9-6.

9:

You can access user-defined functions from Enterprise Manager as shown in Figure 9-7. If you double-click a function, SQL Server displays a modal form for editing its properties (that is, code and permissions). This editor is identical to the editor you use to edit stored procedures (see Figure 9-8).

Figure 9-7.

The execution plan is then stored in the procedure cache, from which it is executed. Different steps in the execution plan will be posted to different modules of the relational engine to be executed: DML manager, DDL manager, stored procedure manager, transaction manager, or utility manager. Results are collected in the form of a result set and sent to the caller.

Figure 9-8.

If you right-click a function and select New User Defined Function, SQL Server opens a form with a template for creating a new function (see Figure 9-9). Once you have written or changed the function, you can use the Check Syntax button to verify it, then select OK or Apply to compile and save it. You can also create and save a function template.

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