京东APP扫码->先将课程加入购物车->然后点开购物车，勾选刚刚的 会出现换购 点击进入->下拉有1元25份抗原，选中后两个一起付即可
SELECT * FROM emlog_sort where pid= ORDER BY sid ASC, taxis asc
error: 1064 , You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ORDER BY sid ASC, taxis asc' at line 1