Gilbarco Veeder-Root Software Developer interview questions

There were two technical and one hr round . All the rounds were of 1 hours duration each . Difficulty level of the data structure question were average. Hr round much about the formal talk

What is“Join” and explain its various types. Give us a program to check for parenthesis matching using stack. What do you mean by a“Composite primary key”? Give differences between Quicksort &Mergesort. When should these sorts be used and what is their running time?