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XML is very flexible . As you ve seen so far, there are very few rules for a well-formed XML document . In an XML document, the actual data is mixed with metadata, such as element and attribute names . Because XML is text, it is very convenient for exchanging data between different systems and even between different platforms . However, when exchanging data, it becomes important to have the metadata fixed . If you had to import a document with customers, orders, as in the preceding examples, every couple of minutes, you d definitely want to automate the importing process . Imagine how hard you d have to work if the metadata changed with every new import . For example, imagine that the Customer element name changes to Client, and Order to Purchase . Or imagine that the orderdate attribute (or element) suddenly changes its data type from timestamp to integer . You d quickly conclude that you should have fixed the schema for the XML documents you are importing . Many different standards have evolved to describe the metadata of XML documents . Currently, the most widely used metadata description is with XML Schema Description (XSD) documents . XSD documents are XML documents that describe the metadata of other XML documents . The schema of an XSD document is predefined . The XSD standard allows you to specify element names, data types, number of occurrences of an element, some constraints, and more . The following example shows an XSD schema describing the element-centric version of customers and their orders:

This is the nal solution if you re dealing only with positive values. However, the logarithm function is unde ned for zero and negative numbers. You can use pivoting techniques to identify and deal with zeros and negatives as follows:

SELECT groupid, CASE WHEN MAX(CASE WHEN val = 0 THEN 1 END) = 1 THEN 0 ELSE CASE WHEN COUNT(CASE WHEN val < 0 THEN 1 END) % 2 = 0 THEN 1 ELSE -1 END * POWER(10., SUM(LOG10(NULLIF(ABS(val), 0)))) END AS product FROM dbo.Groups GROUP BY groupid;

<CustomersOrders> <xsd:schema targetNamespace="InsideTSQL2008-CustomersOrders" xmlns:schema="InsideTSQL2008CustomersOrders" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sqltypes="http://schemas.microsoft.com/sqlserver/2004/sqltypes" elementFormDefault="qualified"> <xsd:import namespace="http://schemas.microsoft.com/sqlserver/2004/sqltypes" schemaLocation="http://schemas.microsoft.com/sqlserver/2004/sqltypes/sqltypes.xsd" /> <xsd:element name="Customer"> <xsd:complexType> <xsd:sequence> <xsd:element name="custid" type="sqltypes:int" /> <xsd:element name="companyname"> <xsd:simpleType> <xsd:restriction base="sqltypes:nvarchar" sqltypes:localeId="1033" sqltypes:sqlCompareOptions="IgnoreCase IgnoreKanaType IgnoreWidth" sqltypes:sqlSortId="52"> <xsd:maxLength value="40" /> </xsd:restriction> </xsd:simpleType> </xsd:element> <xsd:element ref="schema:Order" minOccurs="0" maxOccurs="unbounded" /> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="Order"> <xsd:complexType> <xsd:sequence> <xsd:element name="orderid" type="sqltypes:int" /> <xsd:element name="orderdate" type="sqltypes:datetime" /> </xsd:sequence> </xsd:complexType>

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I'm convinced the XML showplan will lead to the development of numerous tools to help the administrators, programmers, and operational personnel with their daily work. New queries that help to analyze the XML showplans are appearing on the Internet with increasing frequency.

The outer CASE expression rst uses a pivoting technique to check whether a 0 value appears in the group, in which case it returns a 0 as the result. The ELSE clause invokes another CASE expression, which also uses a pivoting technique to count the number of negative values in the group. If that number is even, it produces a +1; if it s odd, it produces a 1. The purpose of this calculation is to determine the numerical sign of the result. The sign ( 1 or +1) is then multiplied by the product of the absolute values of the numbers in the group to give the desired product. Note that NULLIF is used here to substitute zeros with NULLs. You might expect this part of the expression not to be evaluated at all if a zero is found. But remember that the optimizer can consider many different physical plans to execute your query. As a result, you can t be certain of the actual order in which parts of an expression will be evaluated. By substituting zeros with NULLs, you ensure that you ll never get a domain error if the LOG10 function ends up being invoked with a zero as an input. This use of NULLIF, together with the use of ABS, allows this solution to accommodate inputs of any sign (negative, zero, and positive).

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