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Note To apply a certain execution plan in a case where the optimizer would normally opt for another plan that is more ef cient, I had to use a table hint to force using the relevant index. Of course, logical reads shouldn t be the only indication you rely on. Remember that different I/O patterns have different performance and that physical reads are much more expensive than logical reads. But when you see a signi cant difference in logical reads between two options, it is usually a good indication of which option is faster. Figure 4-61 has a graphical depiction of the information from Table 4-10. You can observe many interesting things when analyzing the graph. For example, you can clearly see which plans are based on selectivity and which aren t. You can also see the selectivity point at which one plan becomes better than another.

Let me quickly describe the queries and comment on the results First note that you are already familiar with the XML I am querying, which was created by SELECT with a FOR XML clause I changed it a bit in order to show more examples I changed the second order of the second customer I changed orderid to 10952, to have the same orderid as one of the orders of the first customer I also added a comment node for each customer The first three queries select Customer nodes with child nodes The first query SELECT @xquery( CustomersOrders/Customer/* ) uses an asterisk to select child nodes, which means principal nodes (elements in this context) only The second query SELECT @xquery( CustomersOrders/Customer/node() ) uses the nodes() node type test to select child nodes, and this means all nodes are returned, including comment nodes The third query SELECT @x.

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A grouping set is simply a set of attributes that you group by, such as in a query that has the following GROUP BY clause:

query( CustomersOrders/Customer/comment() ) uses the comment() node type test; therefore, it returns only comment child nodes The fourth query SELECT @xquery( //Customer[@custid=2]/Order ) uses the predicate [@custid=2] inside the Customer element, and then selects Order nodes in next step This means it selects all orders for customer 2 The fifth query SELECT @xquery( //./Order[@ orderid=10952] ) uses abbreviated syntax for the parent axis (two dots) and a predicate [ordered=10952] to find all orders with this order number, no matter the customer The sixth query SELECT @xquery( (/CustomersOrders/Customer/Order/parent::Customer)[2] ) uses the numeric predicate [2] to find the second node returned by the query (/CustomersOrders /Customer/Order/parent::Customer) The query (/CustomersOrders/Customer/Order /parent::Customer) returns all Customer nodes that are children of the CustomersOrders node and that also have at least one Order The seventh query SELECT @x.

INSERT INTO dbo.Orders(orderid, custid, empid, shipperid, orderdate) SELECT n AS orderid, 'C' + RIGHT('000000000' + CAST( 1 + ABS(CHECKSUM(NEWID())) % @numcusts AS VARCHAR(10)), 10) AS custid, 1 + ABS(CHECKSUM(NEWID())) % @numemps AS empid, CHAR(ASCII('A') - 2 + 2 * (1 + ABS(CHECKSUM(NEWID())) % @numshippers)) AS shipperid, DATEADD(day, n / (@numorders / (@numyears * 365.25)), @startdate) -- late arrival with earlier date - CASE WHEN n % 10 = 0 THEN THEN 1 + ABS(CHECKSUM(NEWID())) % 30 ELSE 0 END AS orderdate FROM dbo.Nums WHERE n <= @numorders ORDER BY CHECKSUM(NEWID()); CREATE CLUSTERED INDEX idx_cl_od ON dbo.Orders(orderdate); CREATE NONCLUSTERED INDEX idx_nc_sid_od_cid ON dbo.Orders(shipperid, orderdate, custid); CREATE UNIQUE INDEX idx_unc_od_oid_i_cid_eid ON dbo.Orders(orderdate, orderid) INCLUDE(custid, empid); ALTER TABLE dbo.Orders ADD CONSTRAINT PK_Orders PRIMARY KEY NONCLUSTERED(orderid), CONSTRAINT FK_Orders_Customers FOREIGN KEY(custid) REFERENCES dbo.Customers(custid),

GROUP BY custid, empid, YEAR(orderdate)

query( if (sql:variable( @element )= companyname ) then CustomersOrders/Customer/companyname else CustomersOrders/Customer/Order/orderdate ) uses the conditional if.then.else expression and the SQL Server XQuery extension sql:variable() This function allows you to use SQL Server variables inside XQuery The SQL variable @element is tested inside XQuery; because it is not equal to the string companyname , order dates are returned With help of an outer T-SQL IF block, you can control program flow ..

You de ne a single grouping set (custid, empid, YEAR(orderdate)) Traditionally, aggregate queries de ne a single grouping set, as demonstrated in the previous example SQL Server supports features that allow you to de ne multiple grouping sets in the same query and return a single result set with aggregates calculated for the different grouping sets The ability to de ne multiple grouping sets in the same query was available prior to SQL Server 2008 in the form of options called WITH CUBE and WITH ROLLUP and a helper function called GROUPING However, those options were neither standard nor exible enough SQL Server 2008 introduces several new features that allow you to de ne multiple grouping sets in the same query.

CONSTRAINT FK_Orders_Employees FOREIGN KEY(empid) REFERENCES dbo.Employees(empid), CONSTRAINT FK_Orders_Shippers FOREIGN KEY(shipperid) REFERENCES dbo.Shippers(shipperid);

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