How to group duplicates (by one column name) in a collection, but require values from all columns in the collection
Need advice on how to arrive at this : Collection1(INPUT) - RollNo, StudentName, Subject, Marks //Collection1(input) has about 1000 records 1,ABC,English, 50 1,ABC,Math,60 2,XYZ, English, 60 I want identify all the duplicates by RollNo into anothe...