Match Column Data and get Value

[#1]

A	B
1	100
2	99
3	98
100	1
101	0

I have this table.

I want to set B value ,If my value equals A .

For example ;

C = 1        =>   100

C=100      =>    1  

in my pivot table.

Have nice a day.

[sunny_talwar]

Awesome