1. Introducing SQL : Object Naming Rules : User Names
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User Names
User names used to install and administer Vector can contain the following ASCII characters only: alphanumeric, at (@), pound (#), dollar ($), underscore (_), hyphen (-), period (.). Administrative user names cannot contain a blank character.
Non-administrative user names can contain any characters specific to the installation character set. User names that contain characters outside this range must be delimited.