How to replace with NULL when there is different data in column values?

[#1]

Hi,

I have to replace with NULL when there is different 'Point' for different 'number' and different 'Point' for same 'number'. How can I set this in script.

Please can anyone suggest me.

Thanks.

[#2]

Any help please

[#3]

Thanks. I tried it still showing same data. Please help how to set this.