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-- 1. remove rows in T2 that are not in T1
delete T2
where not exists (
...
    select 1 from T2
    where T1.Ka = T2.Ka and T1.Kb = T2.Kb and ...
)

1.  Pull one row from each result set.
LOOP:
2.  Compare T1 keys to T2 keys
...
5.  Compare T1 and T2 values
6.  If different, generate an "update" statement
7.  "Advance" both T1 and T2, return to loop