Question

3.2. pg_shadow

postgres=# SELECT * FROM pg_shadow;
 usename  | usesysid | usecreatedb | usesuper | usecatupd | userepl |               passwd                | valuntil | useconfig
----------+----------+-------------+----------+-----------+---------+-------------------------------------+----------+-----------
 postgres |       10 | t           | t        | t         | t       |                                     |          |
 wechat   |    16385 | f           | f        | f         | f       | md55bf335eef50073dbc3a4a2103e7b3757 |          |
 test     |    16387 | f           | f        | f         | f       | md505a671c66aefea124cc08b76ea6d30bb |          |
 dba      |    16384 | t           | t        | t         | f       | md5a1453e5a69943d1674eb2f7100efa04c |          |
(4 rows)