What is star scheema in sql

Round1 Hr interview Background, a tableau project 2-3 easy short tableau questions. Ask to send some graphs I made Salary expectation Round 2 Introduction and talk about experience relate to this role How do you improve the dashboard performance? You like and dislike a feature in tableau using What kind of data source you usually used How to gather requirement The metrics in a dashboard, several follow-up questions. Do you have experience in tableau server administration Do you use SQL, some SQL questions If the data is too large, how do you handle it Extract issues in tableau How to choose visualization for graph How to handle too many tasks Ask questions. Round3 NO BEHAVIORAL QUESTION All questions from your resume! Very very detailed. Died in this round.