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CURRENT USER contains the user ID of the current connection.
CURRENT USER can be used as a default value in columns with character data types.
On UPDATE, columns with the CURRENT USER default are not changed unless explicitly updated. The LAST USER default may be used
to track updates by users.
CURRENT_USER is equivalent to CURRENT USER.
Vendor extension. In the SQL/2008 standard, the special register that defines the current user is called CURRENT_USER.