feat:教师端课外训练搜索条件

mec-biz/src/main/resources/config/mybatis/StudentMapper.xml

@@ -641,6 +641,6 @@
             <foreach collection="studentIds" item="studentId" open="(" close=")" separator=",">
                 #{studentId}
             </foreach>
-            AND sub.id__ IS NOT NULL
+            AND sub.id_ IS NOT NULL
     </select>
 </mapper>