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If only one employee quali es, you get the employee ID in the @empid variable. If no employee quali es, the subquery sets @empid to NULL. When you get a NULL, you know that you had no matches. If multiple employees qualify, you get an error saying that the subquery returned more than one value. In such a case, you will realize that something is wrong with your assumptions or with the design of your code. But the problem will surface as opposed to eluding you. When you understand how an assignment SELECT works, you can use it to your advantage. For example, a SET statement can assign only one variable at a time. An assignment SELECT can assign values to multiple variables within the same statement. With well-designed code, this capability can give you performance bene ts. For example, the following code assigns the rst name and last name of a given employee to variables:

Well-Known Text (WKT) Well-Known Binary (WKB) Geography Markup Language (GML)

DECLARE @firstname AS NVARCHAR(10), @lastname AS NVARCHAR(20); SELECT @firstname = NULL, @lastname = NULL; SELECT @firstname = firstname, @lastname = lastname FROM HR.Employees WHERE empid = 3; SELECT @firstname, @lastname;

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Unfortunately, very little spatial data is available in these formats . For purposes of loading commonly available spatial data, none of these formats suffices . Each software company that supports SQL Server 2008 spatial data types provides a data loader . These include ESRI, Pitney Bowes Business Insight (MapInfo), Intergraph, Cadcorp, Autodesk, and Manifold . If you use software provided by one of these vendors, you may already have a way to load spatial data into SQL Server 2008 . Other commercial software packages provide generic data loading support for SQL Server 2008; the best known of these is Safe Software s Feature Manipulation Engine (FME) . With support for more than 200 spatial data formats, FME provides a flexible and powerful way to load data into either the GEOMETRY or GEOGRAPHY data type . FME has the added benefit of working as a Windows program or as an extension to SQL Server Integration Services (SSIS) .

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Notice that this code uses the primary key to lter an employee, meaning that you cannot get more than one row back. The code also initializes the @ rstname and @lastname variables with NULLs. If no employee quali es, the variables simply retain the NULLs. This type of assignment is especially useful in triggers when you want to read attributes from the special tables inserted and deleted into your own variables, after you verify that only one row was affected. Technically, you could rely on the fact that an assignment SELECT performs multiple assignments when multiple rows qualify. For example, you could do aggregate calculations, such as concatenating all order IDs for a given customer:

DECLARE @Orders AS VARCHAR(8000), @custid AS INT; SET @custid = 1; SET @Orders = ''; SELECT @Orders = @Orders + CAST(orderid AS VARCHAR(10)) + ';' FROM Sales.Orders WHERE custid = @custid; SELECT @Orders;

But what if you just want to load shapefiles into the database By far the easiest and most flexible tool to use is the Shape2SQL program provided free of charge by SharpGIS (http://www.sharpgis.net/page/Shape2SQL.aspx) . As illustrated in Figure 14-23, this program offers a single-menu panel interface from which you can load data into a SQL Server table that contains a GEOMETRY or GEOGRAPHY column and create a primary key and spatial index if desired .

You have almost generated the correct number of duplicates for each array, along with the n value representing the matching comma's position. You have one fewer duplicate than the desired number of duplicates for each array. For example, array A has five elements but you have only four rows. The reason that a row is missing for each array is that there's no comma preceding the first element in the array. To fix this small problem, concatenate a comma and the array to generate the first input of the SUBSTRING function: SELECT arrid, array, n FROM dbo.Arrays JOIN dbo.Nums ON n <= LEN(array) AND SUBSTRING(',' + array, n, 1) = ',';

However, this code is far from being standard, and the ability to apply such an assignment SELECT with multiple rows is not of cially documented. This type of assignment is also often used with an ORDER BY clause, assuming that the order of concatenation is guaranteed, like so:

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