修改学生新增

core-domain/src/main/java/cn/com/qmth/examcloud/service/core/entity/Student.java

@@ -30,7 +30,6 @@ public class Student implements Serializable {
 
 	private String studentCode;
 
-	@Column(unique=true)
 	private String identityNumber;
 
 	private String photoPath;