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SET SESSION AUTHORIZATIOPostgreSQL 9.6.19 DocumentSEToSESSION AUTHORIZATION(7)

NAME
       SET_SESSION_AUTHORIZATION - set the session user	identifier and the
       current user identifier of the current session

SYNOPSIS
       SET [ SESSION | LOCAL ] SESSION AUTHORIZATION user_name
       SET [ SESSION | LOCAL ] SESSION AUTHORIZATION DEFAULT
       RESET SESSION AUTHORIZATION

DESCRIPTION
       This command sets the session user identifier and the current user
       identifier of the current SQL session to	be user_name. The user name
       can be written as either	an identifier or a string literal. Using this
       command,	it is possible,	for example, to	temporarily become an
       unprivileged user and later switch back to being	a superuser.

       The session user	identifier is initially	set to be the (possibly
       authenticated) user name	provided by the	client.	The current user
       identifier is normally equal to the session user	identifier, but	might
       change temporarily in the context of SECURITY DEFINER functions and
       similar mechanisms; it can also be changed by SET ROLE (SET_ROLE(7)).
       The current user	identifier is relevant for permission checking.

       The session user	identifier can be changed only if the initial session
       user (the authenticated user) had the superuser privilege. Otherwise,
       the command is accepted only if it specifies the	authenticated user
       name.

       The SESSION and LOCAL modifiers act the same as for the regular SET(7)
       command.

       The DEFAULT and RESET forms reset the session and current user
       identifiers to be the originally	authenticated user name. These forms
       can be executed by any user.

NOTES
       SET SESSION AUTHORIZATION cannot	be used	within a SECURITY DEFINER
       function.

EXAMPLES
	   SELECT SESSION_USER,	CURRENT_USER;

	    session_user | current_user
	   --------------+--------------
	    peter	 | peter

	   SET SESSION AUTHORIZATION 'paul';

	   SELECT SESSION_USER,	CURRENT_USER;

	    session_user | current_user
	   --------------+--------------
	    paul	 | paul

COMPATIBILITY
       The SQL standard	allows some other expressions to appear	in place of
       the literal user_name, but these	options	are not	important in practice.
       PostgreSQL allows identifier syntax ("username"), which SQL does	not.
       SQL does	not allow this command during a	transaction; PostgreSQL	does
       not make	this restriction because there is no reason to.	The SESSION
       and LOCAL modifiers are a PostgreSQL extension, as is the RESET syntax.

       The privileges necessary	to execute this	command	are left
       implementation-defined by the standard.

SEE ALSO
       SET ROLE	(SET_ROLE(7))

PostgreSQL 9.6.19		     2020	  SET SESSION AUTHORIZATION(7)

NAME | SYNOPSIS | DESCRIPTION | NOTES | EXAMPLES | COMPATIBILITY | SEE ALSO

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