PostgreSQL查詢表以及字段的備注

目錄

• 查詢所有表名稱以及字段含義
• 查看所有表名
• 查看表名和備注
• 查看特定表名備注
• 查看特定表名字段

查詢所有表名稱以及字段含義

select c.relname 表名,cast(obj_description(relfilenode,'pg_class') as varchar) 名稱,a.attname 字段,d.description 字段備注,concat_ws('',t.typname,SUBSTRING(format_type(a.atttypid,a.atttypmod) from '\(.*\)')) as 列類型 from pg_class c,pg_attribute a,pg_type t,pg_description d
where a.attnum>0 and a.attrelid=c.oid and a.atttypid=t.oid and d.objoid=a.attrelid and d.objsubid=a.attnum
and c.relname in (select tablename from pg_tables where schemaname='public' and position('_2' in tablename)=0) order by c.relname,a.attnum

查看所有表名

select tablename from pg_tables where schemaname='public' and position('_2' in tablename)=0;

select * from pg_tables;

查看表名和備注

select relname as tabname,cast(obj_description(relfilenode,'pg_class') as varchar) as comment from pg_class c
where relname in (select tablename from pg_tables where schemaname='public' and position('_2' in tablename)=0);

select * from pg_class;

查看特定表名備注

select relname as tabname,
cast(obj_description(relfilenode,'pg_class') as varchar) as comment from pg_class c 
where relname ='表名';

查看特定表名字段

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='表名' and a.attnum>0 and a.attrelid=c.oid and a.atttypid=t.oid and d.objoid=a.attrelid and d.objsubid=a.attnum;