ALTER DEFAULT PRIVILEGES — define default access privileges
ALTER DEFAULT PRIVILEGES
[ FOR { ROLE | USER } target_role [, ...] ]
[ IN SCHEMA schema_name [, ...] ]
abbreviated_grant_or_revoke
where abbreviated_grant_or_revoke is one of:
GRANT { { SELECT | INSERT | UPDATE | DELETE | TRUNCATE | REFERENCES | TRIGGER }
[, ...] | ALL [ PRIVILEGES ] }
ON TABLES
TO { [ GROUP ] role_name | PUBLIC } [, ...] [ WITH GRANT OPTION ]
GRANT { { USAGE | SELECT | UPDATE }
[, ...] | ALL [ PRIVILEGES ] }
ON SEQUENCES
TO { [ GROUP ] role_name | PUBLIC } [, ...] [ WITH GRANT OPTION ]
GRANT { EXECUTE | ALL [ PRIVILEGES ] }
ON FUNCTIONS
TO { [ GROUP ] role_name | PUBLIC } [, ...] [ WITH GRANT OPTION ]
GRANT { USAGE | ALL [ PRIVILEGES ] }
ON TYPES
TO { [ GROUP ] role_name | PUBLIC } [, ...] [ WITH GRANT OPTION ]
GRANT { USAGE | CREATE | ALL [ PRIVILEGES ] }
ON SCHEMAS
TO { [ GROUP ] role_name | PUBLIC } [, ...] [ WITH GRANT OPTION ]
REVOKE [ GRANT OPTION FOR ]
{ { SELECT | INSERT | UPDATE | DELETE | TRUNCATE | REFERENCES | TRIGGER }
[, ...] | ALL [ PRIVILEGES ] }
ON TABLES
FROM { [ GROUP ] role_name | PUBLIC } [, ...]
[ CASCADE | RESTRICT ]
REVOKE [ GRANT OPTION FOR ]
{ { USAGE | SELECT | UPDATE }
[, ...] | ALL [ PRIVILEGES ] }
ON SEQUENCES
FROM { [ GROUP ] role_name | PUBLIC } [, ...]
[ CASCADE | RESTRICT ]
REVOKE [ GRANT OPTION FOR ]
{ EXECUTE | ALL [ PRIVILEGES ] }
ON FUNCTIONS
FROM { [ GROUP ] role_name | PUBLIC } [, ...]
[ CASCADE | RESTRICT ]
REVOKE [ GRANT OPTION FOR ]
{ USAGE | ALL [ PRIVILEGES ] }
ON TYPES
FROM { [ GROUP ] role_name | PUBLIC } [, ...]
[ CASCADE | RESTRICT ]
REVOKE [ GRANT OPTION FOR ]
{ USAGE | CREATE | ALL [ PRIVILEGES ] }
ON SCHEMAS
FROM { [ GROUP ] role_name | PUBLIC } [, ...]
[ CASCADE | RESTRICT ]ALTER DEFAULT PRIVILEGES allows you
to set the privileges that will be applied to objects created in
the future. (It does not affect privileges assigned to
already-existing objects.) Currently, only the privileges for
schemas, tables (including views and foreign tables), sequences,
functions, and types (including domains) can be altered.
You can change default privileges only for objects that will be created by yourself or by roles that you are a member of. The privileges can be set globally (i.e., for all objects created in the current database), or just for objects created in specified schemas. Default privileges that are specified per-schema are added to whatever the global default privileges are for the particular object type.
As explained under GRANT, the default
privileges for any object type normally grant all grantable
permissions to the object owner, and may grant some privileges to
PUBLIC as well. However, this behavior
can be changed by altering the global default privileges with
ALTER DEFAULT PRIVILEGES.
target_roleThe name of an existing role of which the current role is a
member. If FOR ROLE is omitted, the
current role is assumed.
schema_nameThe name of an existing schema. If specified, the default
privileges are altered for objects later created in that schema. If
IN SCHEMA is omitted, the global
default privileges are altered. IN
SCHEMA is not allowed when using ON
SCHEMAS as schemas can't be nested.
role_nameThe name of an existing role to grant or revoke privileges for.
This parameter, and all the other parameters in abbreviated_grant_or_revoke, act as
described under GRANT or REVOKE, except that one is setting
permissions for a whole class of objects rather than specific named
objects.
Use psql's \ddp command to obtain information about existing
assignments of default privileges. The meaning of the privilege
values is the same as explained for \dp under GRANT.
If you wish to drop a role for which the default privileges have
been altered, it is necessary to reverse the changes in its default
privileges or use DROP OWNED BY to get
rid of the default privileges entry for the role.
Grant SELECT privilege to everyone for all tables (and views)
you subsequently create in schema myschema, and allow role webuser to INSERT into them too:
ALTER DEFAULT PRIVILEGES IN SCHEMA myschema GRANT SELECT ON TABLES TO PUBLIC; ALTER DEFAULT PRIVILEGES IN SCHEMA myschema GRANT INSERT ON TABLES TO webuser;
Undo the above, so that subsequently-created tables won't have any more permissions than normal:
ALTER DEFAULT PRIVILEGES IN SCHEMA myschema REVOKE SELECT ON TABLES FROM PUBLIC; ALTER DEFAULT PRIVILEGES IN SCHEMA myschema REVOKE INSERT ON TABLES FROM webuser;
Remove the public EXECUTE permission that is normally granted on
functions, for all functions subsequently created by role
admin:
ALTER DEFAULT PRIVILEGES FOR ROLE admin REVOKE EXECUTE ON FUNCTIONS FROM PUBLIC;
There is no ALTER DEFAULT
PRIVILEGES statement in the SQL standard.
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