How to incorporate a namespaces header into a SQL statement designed for querying XML?

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To incorporate a namespaces header into a SQL statement designed for querying XML, you need to declare and assign a namespace to an alias using the WITH clause. Here's an example SQL statement:

WITH XMLNAMESPACES ('http://www.example.com/ns' as ns) SELECT * FROM mytable WHERE mycolumn.exist('/ns:root') = 1

In this example, the namespace 'http://www.example.com/ns' is assigned to the alias 'ns'. The WHERE clause then uses the alias to query the 'mycolumn' column for the existence of the 'root' element in the namespace 'http://www.example.com/ns'.