I have a table(T1) which contains 2 columns(from,to), I have T2 which is a copy of T1 but it has 1 more column (Length) initially all values in this column is 1.
I want to append the result of inner join of T1 and T2 On T1.to= T2.from to T2 and put the length 2 for these also I want to check if...
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