What is the difference between SQL, Oracle, MySQL, and SQL Server?
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What’s the difference between a view and a materialized view?
What is a unique constraint? How is it different from a primary key?
How are the elements of a 2D array are stored in the memory?
What are the differences between an operational database and a data warehouse?
Which two messages does NameNode get from DataNode?
What is a queue? What difference between queue and stack?
Differentiate between a data engineer and data scientist.
Describe the fundamental idea underlying the Apache Hadoop Framework.
What is the difference between SQL and PL/SQL?
As a data engineer, how would you go about creating a new analytical product?
List the standard port numbers on which Hadoop’s task tracker, NameNode, and job tracker operate.