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{ if (Value.IsNull) this.theCount++; } Next, let s consider the Merge method. This method is used for joining partial aggregates (i.e., groups that are calculated in parallel) before returning the final value. As such, it can be thought of as a set-based version of Accumulate. In this case, each partial group will have an intermediate count, so all Merge has to do is add the counts together: public void Merge(CountNulls Group) { this.theCount += Group.theCount; } The final method required is Terminate. In the case of this aggregate, no additional work will be done, and the method can simply return the count: public SqlInt32 Terminate() { return ((SqlInt32)this.theCount); } Once this aggregate is compiled, we can deploy it to our SQL Server database by using Visual Studio s deployment task, or we can create the assembly in SQL Server using the CREATE ASSEMBLY statement and expose the aggregate using CREATE AGGREGATE. The syntax for CREATE AGGREGATE is similar to that of CREATE FUNCTION; the developer must specify a return data type and an input data type. If the aggregate just listed has been exposed in an assembly called MyUDAs, the following syntax can be used to create the aggregate: CREATE AGGREGATE dbo.CountNulls(@Value VARCHAR(8000)) RETURNS INT EXTERNAL NAME MyUDAs.CountNulls Once created, the aggregate can be used just like a built-in aggregate for example, in a query like the following: SELECT dbo.CountNulls(StringColumn) FROM myTable This query returns the number of NULLs in the StringColumn column of the myTable table.

Figure 2-8. Template Explorer When writing queries, Management Studio supports both an offline mode and a SQLCMD mode. In offline mode, you can be disconnected from the server to write your queries. SQLCMD will be covered in more detail later in the chapter, but for now you should know that in SQLCMD mode, you can write SQLCMD commands directly in SSMS, giving you the editor experience of SSMS and the ability to debug your SQLCMD code without having to run SQLCMD at the command line.

To change the contents of the Toolbox, select the items you want from the Choose Toolbox Items dialog, shown in Figure 4-27.

The final enhancement is autosave. Since SSMS leverages the VS shell, you get recoverability built in. Therefore, if SSMS crashes, you will be prompted on the next startup to recover any work from your previous SSMS session.

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You ll continue to see your familiar grid results window with SSMS, but there are a couple of useful additions. First, you can now print directly from the results pane. Second, XML results are now hyperlinked and can be opened in a separate window. This separate window is actually an XML editor, so you can modify your XML in a richer way. The only downside is that even if you modify the XML, there is no automatic save back to the database. You will have to save the XML to a file and import it, or write T-SQL code to insert it back into the database. Figure 2-9 shows the new linked XML result in SSMS.

The example UDA presented in the previous section shows how easy it is to build a simple aggregate function, but even when you have to control the serialization yourself, the process isn t much more difficult. To help develop a deeper understanding of aggregations and .NET assemblies, the next example shows how to build an aggregate using a .NET UDT, and we ll work with this type within the aggregate.

Though not applicable to BIDS, the Class Explorer in the full Visual Studio can be incredibly useful for developing object-oriented components for your projects. It is a little hidden away in the IDE. Figure 4-28 shows what the Class Explorer looks like.

To see activity in the system such as processes and locks, you normally use the Activity Monitor, which is located in Object Explorer under the Management node. With SQL Server 2005, the Activity Monitor has been enhanced to support both filtering and automatic refresh, both of which are useful when you are running large, complex SQL Server systems that may have many processes running on a single server.

Choosing the Class tab instead of the Solution tab on the Solution pane lets you explore code and projects from a different perspective, showing the classes instead of the files. A class diagram can also be created that represents the classes in the project. Figure 4-29 shows a sample class displayed graphically in this manner. Sometimes it is useful to get a visual take on a desired class structure, especially if it s complex.

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