replace the value with small value for example : 
I have column in table of customer contains very tall number like this 7351267613862 I want replace the value with small value for example.

> 7351267613862 = 1
> 7371867613863 = 2
> 7351267993855 = 3 
How can do this by using SQL script.

Note: this value cloud appear in the table many times.