1、查看当前数据库版本
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mydb=# select version();
version
---------------------------------------------------------------------------------------------------------
PostgreSQL 12.0 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39), 64-bit
2、with子句，查看role和组的关系
with temp as
(select a.rolname,a.rolsuper,m.member from pg_authid a join pg_auth_members m
on a.oid=m.roleid)
select temp.rolname,temp.rolsuper,s.rolname as groupname from temp join pg_authid s
on temp.member = s.oid;
mydb=# with temp as
mydb-# (select a.rolname,a.rolsuper,m.member from pg_authid a join pg_auth_members m
mydb(# on a.oid=m.roleid)
mydb-# select temp.rolname,temp.rolsuper,s.rolname as groupname from temp join pg_authid s
mydb-# on temp.member = s.oid;
rolname | rolsuper | groupname
----------------------+----------+------------
pg_read_all_settings | f | pg_monitor
pg_read_all_stats | f | pg_monitor
pg_stat_scan_tables | f | pg_monitor
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