📘 Day 106: XML in SQL

Welcome to Day 106! Today, we'll explore how to work with XML (eXtensible Markup Language) data in SQL.

What is XML?

XML is a markup language and file format for storing, transmitting, and reconstructing arbitrary data. It defines a set of rules for encoding documents in a format that is both human-readable and machine-readable.

XML in SQL

Similar to JSON, many SQL databases provide support for storing and querying XML data.

Storing XML

You can often store XML data in a TEXT or XML data type.

Querying XML

The syntax for querying XML data varies between databases. It often involves using XPath, a query language for selecting nodes from an XML document.

SQL Server

SQL Server has a rich set of methods for working with the XML data type.

-- .value() method
SELECT data.value('(/product/name)[1]', 'varchar(50)') AS name
FROM products;

Oracle

Oracle also has functions for working with XML.

-- EXTRACTVALUE function
SELECT EXTRACTVALUE(data, '/product/name') AS name
FROM products;

💻 Exercises: Day 106

Please see the exercises.sql file for today's exercises.

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You are on lesson 106 of 108.