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This SQL query is designed to extract specific student information based on their examination marks. It focuses on students whose total marks for three subjects are less than 100. The data is retrieved from two tables: 'student_information' and 'examination_marks'. These tables are joined on the 'roll_number' field, which is a common identifier for students in both tables.
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The SQL query works by performing an INNER JOIN operation on the 'student_information' and 'examination_marks' tables. The join is based on the 'roll_number' field, ensuring that only records with a matching roll number in both tables are included. The query then groups the results by 'roll_number', ensuring that each student's information is grouped together. The HAVING clause is used to filter the results, only including students whose total marks for 'subject_one', 'subject_two', and 'subject_three' are less than 100. The SUM function is used to calculate the total marks for each student.
SELECT a.roll_number,a.name FROM student_information as a INNER JOIN examination_marks as b ON a.roll_number = b.roll_number GROUP BY b.roll_number HAVING SUM(b.subject_one + b.subject_two + b.subject_three) < 100;
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