主题：[求助]提取不重复内容填入其他表

表A：             提取表A中的【项目名称】中不重复内容填到表B中      表B：

项目名称                                                                               项目名称        

A                                                                                         A

V                                                                                         V

B                                                                                         B

A                                                                                         C

B                                                                                         D

C                                                                                        

D

V

命令该怎么写？