一：查看表结构（字段）信息：
Select table_name,column_name,data_type,character_maximum_length from information.columns where table_schema='dd' and table_name='department';
二：查看字段注释信息：
Select a.attnum,(select description from pg_catalog.pg_description where objoid=a.attrelid and objsubid=a.attnum) as descript ,a.attname,pg_catalog.format_type(a.atttypid,a.atttypmod) as data_type from pg_catalog.pg_attribute a where 1=1 and a.attrelid=(select oid from pg_class where relname='department' ) and a.attnum>0 and not a.attisdropped order by a.attnum;
- 注释：其中dd为schema名字，department为表名*
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