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There is also a potential bug in this query. Because each subquery is executed separately, they might end up using different indexes. This means that these queries might not return values from the same row (which they are probably intended to do) if the same value for OrderQty exists for multiple sales order details in any sales order. There are several ways to rewrite this query; the most common one in SQL Server 2005 is probably to use the new APPLY clause. If the subquery is used in either one of the FROM, JOIN, or APPLY clauses, it might also be referred to as a derived table. The APPLY clause basically gives you the opportunity to combine the two subqueries in the previous query into one, splitting the number of subquery executions in half. For the new query to return the same results as the previous query, you must use an OUTER APPLY. (An OUTER APPLY works similarly to a left outer join, and its counterpart, the CROSS APPLY clause, behaves like an inner join.) This is because, in the previous query, the outer query will return a row even if the subqueries return nothing. The new query could be written as follows:

Lesson 3: Planning a Database Migration Strategy . . . . . . . . . . . . . . . . . . . . . . . . . . 266

USE AdventureWorks; SELECT soh.SalesOrderID ,soh.OrderDate ,a.* FROM Sales.SalesOrderHeader AS soh OUTER APPLY ( SELECT TOP(1) sod.UnitPrice, sod.OrderQty FROM Sales.SalesOrderDetail AS sod WHERE sod.SalesOrderID = soh.SalesOrderID ORDER BY sod.OrderQty DESC ) AS a WHERE soh.TerritoryID = 4;

copied. This lock should use two-factor authentication involving elements such as fingerprints, PINs or passwords, Radio Frequency Identification (RFID) tags, or swipe cards. The door should automatically lock when several failed authentications occur.

Standby Categories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

Process Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

7

Technology Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268

Two-factor authentication requires two independent ways to establish identity. This can be a mix of smart card and password, fingerprint and password, or smart card and fingerprint. Both elements must be present for authentication to be possible.

Lesson Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269

Another solution to this type of problem is to make use of the ROW_NUMBER function instead of a correlated subquery. By using the ROW_NUMBER function, you can find the specific number of rows that you need by filtering on the row number rather than using the TOP clause. To be able to filter on the result of the ROW_NUMBER function, the query needs to be placed inside a derived table or a common table expression (CTE). The larger the result set, the better this approach performs compared to the previous queries. The cost for the following query drops from 73 to about 2.88!

Lesson Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269