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The keyword OUTER is optional because the mention of one of the keywords LEFT, RIGHT, or FULL implies an outer join. However, unlike inner joins, where most programmers typically don't specify the optional INNER keyword, most programmers (including me) typically do specify the OUTER keyword. I guess it feels more natural. As I mentioned earlier, SQL Server 2005 will support the nonstandard proprietary syntax for outer joins only under a backward-compatibility flag. To enable the older syntax, change the Northwind database's compatibility mode to 80 (SQL Server 2000): EXEC sp_dbcmptlevel Northwind, 80;

to encapsulate this code in a stored procedure and call that procedure from the CATCH block . What s interesting is that you don t need to pass error information to the stored procedure as input parameters . As long as the procedure is invoked within the CATCH block, it has access to all the error functions .

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Remember that all leaf pages are the same distance from the root, meaning that a seek operation will cost as many page reads as the number of levels in the index The I/O pattern of these reads is random I/O, as opposed to sequential I/O, because naturally the pages read by a seek operation will seldom reside next to each other In terms of our performance estimations, it is important to know the number of levels in an index because that number will be the cost of a seek operation in terms of page reads, and some execution plans invoke multiple seek operations repeatedly (for example, a Nested Loops join operator) For an existing index, you can get this number by invoking the INDEXPROPERTY function with the IndexDepth property.

But for an index that you haven t created yet, you need to be familiar with the calculations that allow you to estimate the number of levels that the index will contain The operands and steps required for calculating the number of levels in an index (call it L) are as follows (remember that these calculations apply to clustered and nonclustered indexes unless explicitly stated otherwise):.

The first time you invoke the code in Listing 6-2, it should cause no error and produce the following output, which indicates that the CATCH block was not reached at all:

Changing the compatibility mode of a database to an earlier version will prevent you from using the new language elements (for example, ranking functions, recursive queries, and so on). I'm just changing the compatibility mode to demonstrate the code. Once I'm done, I'll instruct you to turn it back to 90 (SQL Server 2005).

The number of rows in the table (call it num_rows)

Before TRY/CATCH block. Entering TRY block. After INSERT. Exiting TRY block. After TRY/CATCH block.

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The old-style outer join was indicated in the WHERE clause, not the FROM clause. Instead of =, it used *= to represent a left outer join and =* to represent a right outer join. There was no support for a full outer join. For example, the following query returns customers with their order IDs, and customers with no orders: SELECT C.CustomerID, CompanyName, OrderID FROM dbo.Customers AS C, dbo.Orders AS O WHERE C.CustomerID *= O.CustomerID;

Next, run the code again . It causes a primary key violation error, of course, producing the following output:

However, if a TOP query with an ORDER BY clause is used to de ne a table expression, it s supposed to represent a table with no guaranteed order. Therefore, in such a case the ORDER BY clause is only guaranteed to de ne logical order for the TOP option, while presentation order is not guaranteed. For example, the following query does not guarantee presentation order:

SELECT * FROM (SELECT TOP (3) orderid, customerid FROM dbo.Orders ORDER BY orderid DESC) AS D;

Before TRY/CATCH block. Entering TRY block. Entering CATCH block. Handling PK violation... Error Number : 2627 Error Message : Violation of PRIMARY KEY constraint 'PK_Employees'. Cannot insert duplicate key in object 'dbo.Employees'. Error Severity: 14 Error State : 1 Error Line : 7 Error Proc : Not within proc Exiting CATCH block. After TRY/CATCH block.

This syntax is very problematic because of the lack of separation between an ON filter and a WHERE filter. For example, if you want to return only customers with no orders, using ANSI syntax it's very

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