rails distinct
# Here, I am plucking student_id and student_grade based on the distinct student_grade records
StudentResult.distinct(:student_grade).pluck(:student_id, :student_grade)
rails distinct
# Here, I am plucking student_id and student_grade based on the distinct student_grade records
StudentResult.distinct(:student_grade).pluck(:student_id, :student_grade)
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