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select * from transfer_2708; select accnum , tdate as dt_from , lead(tdate) over(partition by accnum order by tdate)-1 as dt_to , sum(amount) over(partition by accnum order by tdate) as balance from ( -- credit select froom as accnum , tdate , -amount as amount from transfer_2708 union all -- debit select too , tdate , amount from transfer_2708 ) order by 1,2

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