Tata Consultancy Services interview questions

They ask me some questions like Write a program of Constructor in a Student class. Write a program for 2nd highest number in a array. Write a program for bubble sort. Write a query for INNER Join. Write a query for finding second highest salary Difference between Unique key and primary key(I blunder here) How can we implement multiple inheritance in java(I dont able to answer as I have done c++).

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