USER
Returns a VARCHAR containing the name of the user who initiated the current database connection.
	Returns a VARCHAR containing the name of the user who initiated the current database connection.
Behavior type
StableSyntax
USER()
Notes
- 
The USER function does not require parentheses. 
- 
USER is equivalent to CURRENT_USER, SESSION_USER, and USERNAME. 
Examples
=> SELECT USER();
 current_user
--------------
 dbadmin
(1 row)
The following command returns the same results without the parentheses:
=> SELECT USER;
 current_user
--------------
 dbadmin
(1 row)