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create table student ( id numeric, name varchar(50), surname varchar(50) ); create table payment ( student_id numeric, amount numeric, payment_date date ); select student.name,student.surname,(100- sum(payment.amount)),payment.payment_date from student, payment --where month(payment.payment_date) = (month(curdate()) -1) and -- student.id = payment.student_id group by student_id having sum(payment.amount) < 100;
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