查询orace 表属性SQL

工作中要写系统文档，需要导出字段的说明，用这个sql导成excel很方便

SELECT
  a.column_name AS 字段,
  a.data_type AS 数据类型,
  a.data_length AS 长度,
  a.nullable AS 是否为空,
  a.data_default AS 默认值,
  b.comments AS 注释 
FROM
  user_tab_columns a
    LEFT JOIN user_col_comments b ON b.column_name = a.column_name
WHERE
  a.table_name = 'your_table_name' AND b.table_name = 'your_table_name'