如何查看PostgreSQL数据库中所有表

select * from pg_tables;

select tablename from pg_tables where schemaname='public'

postgres=# select tablename from pg_tables where schemaname='public';
 tablename
-----------
 tb_test
(1 行记录)

postgres=# \d tb_test;
                数据表 "public.tb_test"
 栏位 |      类型      | Collation | Nullable | Default
------+----------------+-----------+----------+---------
 id   | integer        |           |          |
 name | character(100) |           |          |

postgres=# insert into tb_test(id,name) values(1,'huangbaokang');
INSERT 0 1
postgres=# select * from tb_test;
 id |                                                 name

----+-----------------------------------------------------------------
---------------------------
  1 | huangbaokang

(1 行记录)

select pg_size_pretty(pg_tablespace_size('pg_default'));

select pg_database.datname, pg_size_pretty(pg_database_size(pg_database.datname)) AS size from pg_databas;

select pg_size_pretty(pg_relation_size('索引字段名'));

select pg_size_pretty(pg_indexes_size('表名'));

select relname,indexrelname, pg_size_pretty(pg_relation_size(relid)) from pg_stat_user_indexes where schemaname='模式名' order by pg_relation_size(relid) desc;

select pg_size_pretty(pg_relation_size('表名'));

select pg_size_pretty(pg_total_relation_size('表名'));

select relname, pg_size_pretty(pg_relation_size(relid)) from pg_stat_user_tables where schemaname='模式名' order by pg_relation_size(relid) desc;

SELECT
    table_size.relname 表名,
    pg_size_pretty ( pg_relation_size ( relid ) ) 表数据大小,
    pg_size_pretty ( pg_indexes_size ( relid ) ) 表总索引大小,
    pg_size_pretty ( pg_total_relation_size ( relid ) ) 表总大小,
    表行数 
FROM
pg_stat_user_tables table_size
    LEFT JOIN (
        SELECT
            relname,
            reltuples :: DECIMAL ( 19, 0 ) 表行数 
        FROM
        pg_class r
        JOIN pg_namespace n ON ( relnamespace = n.oid ) 
        WHERE
            relkind = 'r' 
            AND n.nspname = '模式名' 
        ) table_num ON table_num.relname = table_size.relname 
WHERE
    schemaname = '模式名' 
ORDER BY
    pg_relation_size ( relid ) DESC;