首先，您可以使用mac上的postgre.app或postico连接postgres数据库。运行以下命令：

psql -h localhost -p port_number -d database_name -U user_name -W

然后输入密码，这应该可以访问数据库

要查看psql中的外部表，请运行\dE

运行带有-E标志的psql将响应内部用于实现的查询\dt和类似：

sudo -u postgres psql -E

postgres=# \dt       
********* QUERY **********
SELECT n.nspname as "Schema",
c.relname as "Name", 
CASE c.relkind WHEN 'r' THEN 'table' WHEN 'v' THEN 'view' WHEN 'i' THEN 'index' WHEN 'S' THEN 'sequence' WHEN 's' THEN 'special' END as "Type",
pg_catalog.pg_get_userbyid(c.relowner) as "Owner"
FROM pg_catalog.pg_class c
    LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE c.relkind IN ('r','')
    AND n.nspname <> 'pg_catalog'
    AND n.nspname <> 'information_schema'
    AND n.nspname !~ '^pg_toast'
AND pg_catalog.pg_table_is_visible(c.oid)
ORDER BY 1,2;        
**************************

首次以postgres用户身份登录：sudo su-后期连接到所需的数据库：psql-d databaseName\dt将返回连接到的数据库中所有表的列表。

select 
  * 
from 
  pg_catalog.pg_tables 
where 
  schemaname != 'information_schema' 
  and schemaname != 'pg_catalog';

该SQL查询适用于大多数PostgreSQL版本，非常简单。

select table_name from information_schema.tables where table_schema='public' ;