实验目的和要求
1.掌握查看、重命名及删除用户定义的数据类型的方法。
2.掌握向表中添加、删除及修改数据的方法。
3。综合实验结果
-Experimental purposes and requirements of one. Master view, rename and delete user-defined data type method. 2. Master to the table to add, delete and modify data. 3. Comprehensive experimental results