查看哪些用户对表t1有哪些权限：
part00=# \z t1
Access privileges
Schema | Name | Type | Access privileges | Column access privileges
--------+------+-------+---------------------+--------------------------
public | t1 | table | osdba=arwdDxt/osdba+|
| | | scott=D/osdba |
part00=# \dp t1
Access privileges
Schema | Name | Type | Access privileges | Column access privileges
--------+------+-------+---------------------+--------------------------
public | t1 | table | osdba=arwdDxt/osdba+|
| | | scott=D/osdba |
(1 row)
可以看出有两个用户osdba和scott，osdba用arwdDxt权限，scott用户有D权限。
字母代表的权限的意思如下：
a: insert
r: select
w: update
d: delete
x: references
t: trigger
D: truncate
也可以查询系统视图pg_class
part00=# select relname,relacl from pg_class where relname='t1';
relname | relacl
---------+-------------------------------------
t1 | {osdba=arwdDxt/osdba,scott=D/osdba}
(1 row)
如果想查询用户scott有哪些权限，可以查询系统表information_schema.role_table_grants:
part00=# select * from INFORMATION_SCHEMA.role_table_grants where grantee='scott';
grantor | grantee | table_catalog | table_schema | table_name | privilege_type | is_grantable | with_hierarchy
---------+---------+---------------+--------------+------------+----------------+--------------+----------------
osdba | scott | part00 | public | t4 | SELECT | NO | NO
osdba | scott | part00 | public | t1 | TRUNCATE | NO | NO
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