Greenplum 獲取表comment信息

查看錶字段的comment信息,如果字段沒有comment則顯示空

SELECT 'tablename' as table_name
	,a.attname                            AS column_name
	,format_type(a.atttypid, a.atttypmod) AS data_type
	,d.description                        AS description
	,a.attnum
	,a.attnotnull                         AS notnull
	,coalesce(p.indisprimary, FALSE)      AS primary_key
	,f.adsrc                              AS default_val
FROM   pg_attribute    a
LEFT   JOIN pg_index   p ON p.indrelid = a.attrelid AND a.attnum = ANY(p.indkey)
LEFT   JOIN pg_description d ON d.objoid  = a.attrelid AND d.objsubid = a.attnum
LEFT   JOIN pg_attrdef f ON f.adrelid = a.attrelid  AND f.adnum = a.attnum
WHERE  a.attnum > 0
AND    NOT a.attisdropped
AND    a.attrelid = 'tablename'::regclass
ORDER  BY a.attnum;


tablename : 表的名字

展示效果如下

table_name	column_name	data_type	description	attnum	notnull	primary_key	default_val
log_history.table_mapping	record_id	character varying(50)	表的唯一鍵	1	f	f
log_history.table_mapping	create_table	character varying(2000)	創建的新表	2	f	f
log_history.table_mapping	create_user	character varying(50)	新表的創建者	3	f	f