把里边的public改成相应模式名（默认为public，可不改）
table_name改成对应表名称
SELECT AA.*,BB.DESC FROM
(
SELECT
A.ORDINAL_POSITION AS COL_NUM,
A.COLUMN_NAME AS COL_NAME,
A.DATA_TYPE AS COL_TYPE,
A.CHARACTER_MAXIMUM_LENGTH AS COL_LEN,
A.NUMERIC_PRECISION AS COL_PREC,
A.DATETIME_PRECISION AS COL_TIME_PREC,
A.IS_NULLABLE AS COL_NULLABLE,
A.COLUMN_DEFAULT AS COL_DEFAULT
FROM INFORMATION_SCHEMA.COLUMNS A
WHERE A.TABLE_SCHEMA = 'public' AND A.TABLE_NAME = 'table_name'
)
AS AA LEFT JOIN
(
SELECT
OBJSUBID,
DESCRIPTION AS DESC
FROM PG_DESCRIPTION
WHERE OBJOID =
(
SELECT RELID FROM PG_STAT_ALL_TABLES WHERE SCHEMANAME = 'public' AND RELNAME = 'table_name'
)
)
AS BB ON AA.COL_NUM = BB.OBJSUBID ORDER BY AA.COL_NUM;
