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Working with XML data in SQL Server

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Problem

Extensible Markup Language (XML) is widely used in applications to share data between users. As more information is stored, exchanged, and presented in XML, it’s crucial to have the ability to query XML data effectively.

XML’s strength lies in its versatility to represent various types of information from different sources. To make the most of this flexibility, an XML query language needs features that allow us to retrieve and understand data from these diverse sources.

How do you deal with XML data using T-SQL?

Solution

XML Terms and Definitions

Let’s take into consideration the following XML example:

Nodes

Root: The top-most ancestor for all nodes, in our case <Patients>.
Element: A start tag and an end tag, like <Name>…</Name>.
Attribute: Represents an attribute of an element, providing additional information about it, like “Id” and “MedicalRecord” for <Patient>.
Text: Contains the text within an element, like “30” is the te