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One option is from the current session s Query Options dialog box (choose the Query Options item from the Query menu or choose Query Options in the session s shortcut menu) . This option affects the current editor window . Another option is from the Options dialog box . (Go to Tools, then Options, then on the left pane navigate to Query Results, SQL Server, and then to Results to Grid or Results to Text, depending on your current setting .) This option affects only new editor windows that you open and not the current one .

Start by running a query against a million rows from Nums, with an inline expression that adds 1 to n:

Once you have completed these actions, the application is deployed and we can view the output of our case study. If you have trouble deploying the application components, refer to the Administration Guide within the WebLogic documentation. There is one portion of our environment that we have not yet configured. The client side that we discussed in section 6.2 consists of the Palm emulator

SELECT n, n + 1 AS n_plus_one FROM dbo.Nums WHERE n <= 1000000;

orderdate DATETIME NOT NULL, filler CHAR(200) NOT NULL DEFAULT('a'), CONSTRAINT PK_Orders PRIMARY KEY NONCLUSTERED(orderid) ); CREATE CLUSTERED INDEX idx_orderdate ON dbo.Orders(orderdate); CREATE INDEX idx_custid ON dbo.Orders(custid); CREATE INDEX idx_empid ON dbo.Orders(empid); INSERT INTO dbo.Orders(orderid, custid, empid, orderdate) SELECT orderid, custid, empid, orderdate FROM InsideTSQL2008.Sales.Orders;

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Write a stored procedure that queries and filters orders based on user inputs . The stored procedure should have a parameter for each of the order attributes: orderid, custid, empid, and orderdate . All parameters should have a default value NULL . If a parameter was assigned with a value, your stored procedure should filter the rows in which the corresponding column is equal to the parameter s value; otherwise (parameter is NULL), the parameter should simply be ignored . Note that all four columns in the Orders table were defined as NOT NULL, so you can rely on this fact in your solutions .

Here s one common solution that uses static code:

with the EzWAP browser that renders WML. If you are not able to re-create this environment, all you need is a browser that renders WML. In lieu of that, you may also use a web browser such as Internet Explorer and examine the contents of the response.

CREATE PROC dbo.GetOrders @orderid AS INT = @custid AS INT = @empid AS INT = @orderdate AS DATETIME = WITH RECOMPILE AS NULL, NULL, NULL, NULL

SELECT orderid, custid, empid, orderdate, filler FROM dbo.Orders WHERE (orderid = @orderid OR @orderid IS NULL) AND (custid = @custid OR @custid IS NULL) AND (empid = @empid OR @empid IS NULL) AND (orderdate = @orderdate OR @orderdate IS NULL); GO

I created the stored procedure with the RECOMPILE option to generate a new execution plan whenever the code is run . Without the RECOMPILE option, regardless of the inputs, the stored procedure would reuse the cached execution plan generated for the first invocation, which is not a good idea in this case . The main trick here is to use the following expression for each input:

To load the initial screen of our application, enter the URL http://localhost:7001/book/DiagnosticApp action=menu. This request calls the DiagnosticApp servlet, which in turn loads the ApplicationMenu and returns it to the user. Figure 6.11 depicts the results of this request. The right side of this picture is the list of menu options.

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(<col> = <@parameter> OR <@parameter> IS NULL)

If a value is specified for <@parameter>, then <@parameter> IS NULL is false, and the expression is equivalent to <col> = <@parameter> alone . If a value is not specified for <@parameter>, it will be NULL, and <@parameter> IS NULL will be true, making the whole expression true . The problem with this implementation is that it produces inefficient plans . The optimizer doesn t have the capability to create different branches of a plan, where each branch represents a completely different course of action based on whether a parameter contains a known value or a NULL . Remember that the stored procedure was created with the RECOMPILE option, meaning that for each invocation of the stored procedure the optimizer generated a plan that it perceived as adequate for the given inputs . Still, the plans that the optimizer generated were inefficient . Run the following code, which invokes the stored procedure with different arguments:

EXEC EXEC EXEC EXEC dbo.GetOrders dbo.GetOrders dbo.GetOrders dbo.GetOrders @orderid @orderdate @custid @empid = = = = 10248; '20070101'; 3; 5;

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