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What is a unique constraint? How is it different from a primary key?
What is a surrogate key?
What is a composite key?
What is a foreign key?
What is a primary key?
What’s the difference between a view and a materialized view?
What is a view? When would you use one?
What is the purpose of the IN keyword?
What is the purpose of the BETWEEN keyword?
What are the different DML commands in SQL? Give a description of their purpose.
What are the different DDL commands in SQL? Give a description of their purpose.
What is the difference between SQL and T-SQL?
What is the difference between SQL and PL/SQL?
What is the difference between SQL, Oracle, MySQL, and SQL Server?
What Skills Does a Data Engineer Need?
Mention some of Hadoop’s key attributes.
Describe the fundamental idea underlying the Apache Hadoop Framework.
How does orchestration work?
How does schema evolution work?
Which two messages does NameNode get from DataNode?
As a data engineer, how would you go about creating a new analytical product?
Differentiate between a data engineer and data scientist.
What are the differences between an operational database and a data warehouse?
What does a skewed table mean in Hive?
Can you create more than one table in Hive for the same data file?
Describe the purpose of the .hiverc file in Hive.
Describe how Hive is used in the Hadoop ecosystem.
List the elements of the Hive data model.
What does SerDe in the Hive mean?