1SET SESSION AUTHORIZATION(P7o)stgreSQL 11.6 DocumentatSiEoTnSESSION AUTHORIZATION(7)
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NAME

6       SET_SESSION_AUTHORIZATION - set the session user identifier and the
7       current user identifier of the current session
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SYNOPSIS

10       SET [ SESSION | LOCAL ] SESSION AUTHORIZATION user_name
11       SET [ SESSION | LOCAL ] SESSION AUTHORIZATION DEFAULT
12       RESET SESSION AUTHORIZATION
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DESCRIPTION

15       This command sets the session user identifier and the current user
16       identifier of the current SQL session to be user_name. The user name
17       can be written as either an identifier or a string literal. Using this
18       command, it is possible, for example, to temporarily become an
19       unprivileged user and later switch back to being a superuser.
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21       The session user identifier is initially set to be the (possibly
22       authenticated) user name provided by the client. The current user
23       identifier is normally equal to the session user identifier, but might
24       change temporarily in the context of SECURITY DEFINER functions and
25       similar mechanisms; it can also be changed by SET ROLE (SET_ROLE(7)).
26       The current user identifier is relevant for permission checking.
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28       The session user identifier can be changed only if the initial session
29       user (the authenticated user) had the superuser privilege. Otherwise,
30       the command is accepted only if it specifies the authenticated user
31       name.
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33       The SESSION and LOCAL modifiers act the same as for the regular SET(7)
34       command.
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36       The DEFAULT and RESET forms reset the session and current user
37       identifiers to be the originally authenticated user name. These forms
38       can be executed by any user.
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NOTES

41       SET SESSION AUTHORIZATION cannot be used within a SECURITY DEFINER
42       function.
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EXAMPLES

45           SELECT SESSION_USER, CURRENT_USER;
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47            session_user | current_user
48           --------------+--------------
49            peter        | peter
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51           SET SESSION AUTHORIZATION 'paul';
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53           SELECT SESSION_USER, CURRENT_USER;
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55            session_user | current_user
56           --------------+--------------
57            paul         | paul
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COMPATIBILITY

60       The SQL standard allows some other expressions to appear in place of
61       the literal user_name, but these options are not important in practice.
62       PostgreSQL allows identifier syntax ("username"), which SQL does not.
63       SQL does not allow this command during a transaction; PostgreSQL does
64       not make this restriction because there is no reason to. The SESSION
65       and LOCAL modifiers are a PostgreSQL extension, as is the RESET syntax.
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67       The privileges necessary to execute this command are left
68       implementation-defined by the standard.
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SEE ALSO

71       SET ROLE (SET_ROLE(7))
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75PostgreSQL 11.6                      2019         SET SESSION AUTHORIZATION(7)
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