2 SQL

Although many consider SQL to be a query language, do not underestimate its power and the great need to master it! Don’t be surprised if you spend a significant amount of time discussing SQL techniques and problem-solving approaches in a data engineering interview. In addition to using it for queries in databases, SQL is regularly utilized as a data processing pattern within various Big Data frameworks as KafkaSQL, SparkSQL, Python libraries, etc. If you are proficient in using SQL itself, that knowledge would be a valuable indicator that you can also be efficient in these Big Data Frameworks. A big plus for you!