how to compare two fields and mark it as perfect if 90 percent of data in two fields matches

[naveen341]

HI Have two different fields coming from two different sources.

When i do comparision i would like to mark it as perfect when 90% of the data matches how can we do this kind of comparision.

Ex: data 1: 1044 lakehurst drive,Apt #103, waukegan ,il

Data 2: 1044 lakehurst dr Apt  103 waukegan ,il.

O/p Data1=data2.

Regards,

Naveen.