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postgresql - How do I remove all spaces from a field in a Postgres database in an update query?

What would be the proper syntax used to run an update query on a table to remove all spaces from the values in a column?

My table is called users and in the column fullname some values look like 'Adam Noel'. I want to remove the space so that the new value is 'AdamNoel'

I have like 30k rows

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update users
  set fullname = replace(fullname, ' ', '');

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