SELECT
  c.relname 表名称,
 A.attname AS 字段名称,
 col_description(A.attrelid,A.attnum) AS 注释,
 format_type ( A.atttypid, A.atttypmod ) AS 类型,
 CASE WHEN A.attnotnull='f' THEN '否' ELSE '是' END AS 是否必填,
 a.attnum 序号
FROM
 pg_class AS c,
 pg_attribute AS a
WHERE
 A.attrelid = C.oid 
 AND A.attnum > 0
 ORDER BY c.relname,a.attnum;

SELECT
 c.relname 表名称,
 A.attname AS 字段名称,
 split_part(col_description ( A.attrelid, A.attnum ),'：',1) AS 注释,
 format_type ( A.atttypid, A.atttypmod ) AS 类型,
 CASE WHEN A.attnotnull='f' THEN '否' ELSE '是' END AS 是否必填,
 a.attnum 序号
FROM
 pg_class AS c,
 pg_attribute AS a
WHERE
 c.relnamespace=16389
 AND c.relname not like 'v_%'
 AND c.relname not like 'pk_%'
 AND c.relname not like 'unidx%'
 AND c.relname not like '%_index'
 AND c.relname not like '%_seq'
 AND c.relname not like '%_pkey'
 AND A.attrelid = C.oid 
 AND A.attnum > 0
 ORDER BY c.relname,a.attnum;

select * from information_schema.columns
where table_schema='public' and table_name='表名称 ';