Nagarro Interview Question

Q1. Basic Question related to ITIL - difference between Incident & Problem Management Q2. Questions related to sql - difference b/w delete & truncate ,clustered & non clustered indexing in sql ,difference b/w function & procedure ,what are triggers , diff b/w inner join & outer join Q3. Question related to java - diff b/w stack memory & heap memory, what is inheritance , what is interface , can we achieve multilevel inheritance in java Q4. Question related to linux - differ b/w find & grep , how to check that how many process are currently running & how to kill a specific process , how to execute a script in background