实现的功能类似MySQL：
show tables;
在 PostgreSQL 中需要写：
select * from pg_tables where schemaname = 'public';
返回结果类似如下：
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schemaname | tablename | tableowner | tablespace | hasindexes | hasrules | hastriggers | rowsecurity
------------+-----------+------------+------------+------------+----------+-------------+-------------
public | deploy | postgres | | t | f | f | f
public | deploy2 | postgres | | f | f | f | f
(2 rows)
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补充：PostgreSql 获取所有的表、视图、字段、 主键
PostgreSQL获取数据库中所有view名 视图：
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SELECT viewname FROM pg_views
WHERE schemaname ='public'
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postgreSQL获取数据库中所有table名 表：
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SELECT tablename FROM pg_tables
WHERE tablename NOT LIKE 'pg%'
AND tablename NOT LIKE 'sql_%'
ORDER BY tablename;
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postgreSQL获取某个表tablename 所有字段名称 ， 类型，备注,是否为空 等
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SELECT col_description(a.attrelid,a.attnum) as comment,pg_type.typname as typename,a.attname as name, a.attnotnull as notnull
FROM pg_class as c,pg_attribute as a inner join pg_type on pg_type.oid = a.atttypid
where c.relname = 'tablename' and a.attrelid = c.oid and a.attnum>0
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postgreSQL获取某个表tablename 的主键信息
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select pg_attribute.attname as colname,pg_type.typname as typename,pg_constraint.conname as pk_name from
pg_constraint inner join pg_class
on pg_constraint.conrelid = pg_class.oid
inner join pg_attribute on pg_attribute.attrelid = pg_class.oid
and pg_attribute.attnum = pg_constraint.conkey[1]
inner join pg_type on pg_type.oid = pg_attribute.atttypid
where pg_class.relname = 'tablename'
and pg_constraint.contype='p'
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以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。如有错误或未考虑完全的地方，望不吝赐教。
原文链接：https://blog.csdn.net/panguangyuu/article/details/90052039