Oracle获取表字段名 字段类型 字段长度 注释

SELECT ments as 注释,a.column_name as 列名,a.data_type || '(' || a.data_length || ')' as 数据类型,a.nullable as 是否为空FROM user_tab_columns a, user_col_comments bWHERE a.TABLE_NAME = '表名'and b.table_name = '表名'and a.column_name = b.column_name