postgreSQL (2) 表和字段註釋

關於的information_schema.tables和information_schema.columns詳解
blog.csdn.net/gaowei_132/…
根據字段名查詢表名

SELECT a.attnum, 
      a.attname ,
      c.relname
FROM pg_class c, 
    pg_attribute a
WHERE a.attnum > 1
     and c.oid = a.attrelid
   		and a.attname='title_id'
ORDER BY a.attnum;
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根據表名查詢列名

SELECT a.attnum, 
       a.attname 
FROM pg_class c, 
     pg_attribute a
WHERE c.relname = 'employee_info'
--   and a.attnum > 1
      and c.oid = a.attrelid
 ORDER BY a.attnum;
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SELECT * FROM pg_description; 
SELECT * FROM pg_class cl WHERE cl.relname='dl_car_info' ; -- oid 行標識符(隱藏屬性; 必須明確選擇)

SELECT dc.* FROM pg_class cl JOIN pg_description dc ON cl.oid=dc.objoid WHERE cl.relname='dl_car_info' ;



select relname as tabname,
cast(obj_description(relfilenode,'pg_class') as varchar) as comment from pg_class c 
where  relkind = 'r' and relname = 'dl_car_info' order by relname;

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