title: Replace all email addresses after '@' in PostgresSQL
body: <p>I have a list of emails. I want to change all of them to test emails for my test system e.g. sam@gmail.com to sam@test.com. I don't want to use actual emails as those emails are valid and it will be bad for users to receive such email. Is it possible to change all emails at once in a single query? If so, can anyone share? Thanks.</p>