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CREATE TABLE table1 ([account_number] int, [Amount] int) ; INSERT INTO table1 ([account_number], [Amount]) VALUES (13, 40), (14, 30), (14, 30), (13, 60), (14, 10) ; SELECT ( ( SELECT Sum(amount) FROM table1 WHERE account_number = 13 ) / ( SELECT Sum(amount) FROM ( SELECT Sum(amount) FROM table1 WHERE account_number IN (13, 14) GROUP BY account_number ORDER BY Sum(amount) ) ) )

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