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Current Timestamp


I need to write a technical document for a testing procedure.
one of the steps is to have someone run a query wich will update a specific feild to the current timestamp. I know there is a function in MySQL that does this but im not sure how to use it in a query.
does anyone have a simple way to do this?

update host_users set last_updated = 'current timestamp here' where uname = 'username'




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