獲取資料庫中所有table名：
select tablename from pg_tables
where tablename not like 'pg%'
and tablename not like 'sql_%'
order by tablename;
select tablename,obj_description(relfilenode,'pg_class') from pg_tables a, pg_class b
where
a.tablename = b.relname
and a.tablename not like 'pg%'
and a.tablename not like 'sql_%'
order by a.tablename;
select col_description(a.attrelid,a.attnum) as comment,format_type(a.atttypid,a.atttypmod) as type,a.attname as name, a.attnotnull as notnull
from pg_class as c,pg_attribute as a
where c.relname = 'tablename' and a.attrelid = c.oid and a.attnum>0
select a.attnum,a.attname,concat_ws('',t.typname,substring(format_type(a.atttypid,a.atttypmod) from '\(.*\)')) as type,d.description from pg_class c, pg_attribute a , pg_type t, pg_description d
where c.relname = 'table_name' and a.attnum>0 and a.attrelid = c.oid and a.atttypid = t.oid and d.objoid=a.attrelid and d.objsubid=a.attnum
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