Hi, 

Supposed a model:

db.define_table('test',
    Field('t1', 'integer'),
    Field('t2', 'integer'),
    )

How to find the difference in db.test.t1 (ex: db.test.t2(row2) = 
db.test.t1(row2) - db.test.t1(row1)) and store the result in db.test.t2.

What approach should i used? Thanks.

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