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select a.class, a.SumOftotal, a.SumOfremaining, b.SumOfammount from
SELECT Students.class, Sum(Students.total) AS SumOftotal, Sum(Students.remaining) AS SumOfremaining
GROUP BY Students.class
) as a
SELECT payments.class, Sum(payments.ammount) AS SumOfammount
GROUP BY payments.class
) as b on a.class = b.class
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SELECT p.class , SUM(s.total) as total , SUM(s.remaining) as remaining , SUM(p.ammount) as ammount
Students as s
INNER JOIN payments as p ON p.class = s.class
GROUP BY p.class
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