postgresql 查看表、列的备注信息

最近在整理postgresql数据库的表、列的备注信息时，用到了如下的sql

表的备注

with tmp_tab as (
    select pc.oid,pc.*
      from pg_class pc
      where 1=1
       and pc.relkind in ('r')
       and pc.relnamespace = 2200 -- select pn.oid, pn.* from pg_namespace pn where 1=1
       and pc.oid not in (
          select inhrelid
            from pg_inherits
       )
       and pc.relname not like '%peiyb%'
    order by pc.relname
),tmp_desc as (
   select pd.*
     from pg_description pd
    where 1=1
      and pd.objsubid = 0
      --and pd.objoid=168605
)
select tab.relname,
       de.description
  from tmp_tab tab
       left outer join tmp_desc de
                    on tab.oid = de.objoid 
order by tab.relname                   
;

列的备注

with tmp_tab as (
    select pc.oid,pc.*
      from pg_class pc
      where 1=1
       and pc.relkind in ('r')
       and pc.relnamespace = 2200 -- select pn.oid, pn.* from pg_namespace pn where 1=1
       and pc.oid not in (
          select inhrelid
            from pg_inherits
       )
       and pc.relname not like '%peiyb%'
    order by pc.relname
),tmp_col as (
   select pa.*
     from pg_attribute pa
    where 1=1
      --and pa.attrelid = 168605
      and pa.attname not in (
      'tableoid',
      'cmax',
      'xmax',
      'cmin',
      'xmin',
      'ctid'
      )
),tmp_desc as (
   select pd.*
     from pg_description pd
    where 1=1
      and pd.objsubid <> 0
      --and pd.objoid=168605
)
select tab.relname,
       tc.attname,
       de.description
  from tmp_tab tab
       left outer join tmp_col tc
                    on tab.oid = tc.attrelid
       left outer join tmp_desc de
                    on tc.attrelid = de.objoid and tc.attnum = de.objsubid
order by tab.relname, tc.attnum                    
;

参考:
http://postgres.cn/docs/9.6/catalog-pg-class.html
http://postgres.cn/docs/9.6/catalog-pg-attribute.html
http://postgres.cn/docs/9.6/catalog-pg-description.html