查询而且导出数据表结构

sql语句:sql table_name :要查询的数据表3d SELECT t.colUMN_NAME as "字段名", t.DATA_TYPE || '(' || t.DATA_LENGTH || ')' as "数据类型", t1.COMMENTS as "字段说明" FROM User_Tab_Cols t, User_Col_Comments t1 WHERE
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