Paramount Interview Question

Several Questions related to Tableau such as difference between Data Blending & Data joining, what is data visualization, what is the difference between groups & sets in Tableau, difference between live & extract mode SQL- How do you optimize the performance of the query What is the difference between UNION and UNION ALL different types of JOIN and when do you use them Several behavioral questions, one of the behavioral question that was repeated by all the interviewers - How do you handle a difficult customer & situation? Seems like they were preparing the candidate right from the interview process itself