postgresql 查询表结构

SELECT 
 A.attnum,
	( SELECT description FROM pg_catalog.pg_description WHERE objoid = A.attrelid AND objsubid = A.attnum ) AS descript,
	A.attname,
	( select typname from pg_type where oid = A.atttypid) AS type,
	A.atttypmod AS data_type 
FROM
	pg_catalog.pg_attribute A
WHERE
	1 = 1 
	AND A.attrelid = ( SELECT oid FROM pg_class WHERE relname = '表名' ) 
	AND A.attnum > 0 
	AND NOT A.attisdropped 
ORDER BY
	A.attnum;