SQL basic, like joins, union vs union all, grouby, sub query, order by, view, top salary, second top salaray, etc... turning and troubleshooting Python array, list, set, common data structure and sort algorithm Hadoop, Vertica, Spark SQL, Spark Stream, Kafka big data

usually for each position has a specific goal for experience candidate, and require to show hands on experience to match the position required both technical and communication skills. A couple of interviews with team members and hiring manager...