上图是tp的sql写法。

SELECT * FROM `bg_coupons` WHERE `usercard` = '100002345' AND `usedate` is null OR usedate = '0000-00-00 00:00:00' AND `couponsdate` <= '2016-11-09 10:21:41' AND `couponedate` >= '2016-11-09 10:21:41' AND `couponscode` = '343' LIMIT 1
这个是解析后的原生sql语句

SELECT * FROM `bg_coupons` WHERE `usercard` = '100002345' AND (`usedate` is null OR usedate = '0000-00-00 00:00:00') AND `couponsdate` <= '2016-11-09 10:21:41' AND `couponedate` >= '2016-11-09 10:21:41' AND `couponscode` = '343' LIMIT 1
这个是我手写的原生SQL语句

问题：请问，用TP写法，如何实现最后一条原生sql语句呢？