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You can use similar techniques when you just want to assign a sequence of unique values starting with 1 (and increasing by 1 from there) that is unrelated to any existing sequence. I will describe such techniques later in the chapter in the "Assignment UPDATE" section. So far, I demonstrated inserting a result set into a target table and modifying the rows with new sequence values. Instead, you can use a SELECT INTO statement to populate a temporary table with the target rows, and also to assign row numbers starting with 1 and increasing by 1 from there. (Let's call the column rn.) To generate the row numbers, you can use the IDENTITY function in SQL Server 2000 and the ROW_NUMBER function in SQL Server 2005. Right after the insert, store the @@rowcount value in a local variable (@rc) and invoke the procedure usp_SyncSeq to increment the sequence by @rc and assign the first sequence value in the new block to your variable (@key).

Using Windows Explorer, locate the folder that contains the presentation template and images for the template you want to customize For this procedure, the folder is at the following location (as noted in step 2): < Drive>:\Program Files\Microsoft Producer\<LanguageID>\Templates\video slides html toc resize 5 Click the folder to select it From the Edit menu, click Copy 6 Click the folder named Templates to select it From the Edit menu, click Paste to paste a copy of the presentation template folder into the Templates folder A copy of the template folder named Copy of video slides html toc resize appears in the right pane of Windows Explorer The folder for your custom template must be in the \Program Files\Microsoft Producer\<LanguageID>\Templates\ folder if you want the template to be displayed as an option in the Producer Media tab and the New Presentation Wizard..

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Finally, query the temporary table, calculating the new sequence values as rn + @key 1. Here's the complete code sample demonstrating this technique: IF OBJECT_ID('tempdb..#CustsStage') IS NOT NULL DROP TABLE #CustsStage GO DECLARE @key AS INT, @rc AS INT; SELECT CustomerID, IDENTITY(int, 1, 1) AS rn -- In 2005 can use ROW_NUMBER() OVER(ORDER BY CustomerID) INTO #CustsStage FROM Northwind.dbo.Customers WHERE Country = N'UK'; SET @rc = @@rowcount; EXEC dbo.usp_SyncSeq @val = @key OUTPUT, @n = @rc; SELECT CustomerID, rn + @key - 1 AS KeyCol FROM #CustsStage;

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However, #if statements have several drawbacks:

The synchronous sequencing mechanism doesn't allow gaps, but it might cause concurrency problems. Remember that you must exclusively lock the sequence to increment it, and then you must maintain the lock until the transaction finishes. The longer the transaction is, the longer you lock the sequence. Obviously, this solution can cause queues of processes waiting for the sequence resource to be released. But there's not much you can do if you want to maintain a synchronous sequence. However, there are cases where you might not care about having gaps. For example, suppose that all you need is a key generator that will guarantee that you will not generate the same key twice. Say that you need those keys to uniquely identify rows across tables. You don't want the sequence resource to be locked for the duration of the transaction. Rather, you want the sequence to be locked for a fraction of a second while incrementing it, just to prevent multiple processes from getting the same value. In other words, you need an asynchronous sequence, one that will work much faster than the synchronous one, allowing better concurrency. One option that would address these requirements is to use built-in functions that SQL Server provides you to generate GUIDs. I'll discuss this option shortly. However, GUIDs are long (16 bytes). You might prefer to use integer sequence values, which are substantially smaller (4 bytes). To achieve such an asynchronous sequencing mechanism, you create a table (AsyncSeq) with an identity column as follows: USE tempdb; GO IF OBJECT_ID('dbo.AsyncSeq') IS NOT NULL DROP TABLE dbo.AsyncSeq; GO CREATE TABLE dbo.AsyncSeq(val INT IDENTITY(1,1));

Create the following usp_AsyncSeq procedure to generate a new sequence value and return it through the @val output parameter: IF OBJECT_ID('dbo.usp_AsyncSeq') IS NOT NULL DROP PROC dbo.usp_AsyncSeq; GO CREATE PROC dbo.usp_AsyncSeq @val AS INT OUTPUT AS BEGIN TRAN SAVE TRAN S1; INSERT INTO dbo.AsyncSeq DEFAULT VALUES; SET @val = SCOPE_IDENTITY() ROLLBACK TRAN S1; COMMIT TRAN GO

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