SQL Server XML Replace values in attribute

Question

I want to replace the value in an attribute in a XML. This attribute comes multiple times in the xml. How can i replace these all at once

my xml lools some what like

Answer 1

You can try the following. Here ns2zarejestrujStanZgodyAsync is main node and I have updated the value of idSystemy from 13 to 38.

UPDATE @t
SET yourXML.modify('replace value of 
(/ns2zarejestrujStanZgodyAsync/rejestrujStanZgody/idSystemy/text())[1] with ("38")')

You can check for demo here- XML Node Update