During the interview, I was asked to explain the difference between COUNT(*) and COUNT(column). I was also given questions to practically demonstrate different types of JOINs and explain how I would use CASE statements in SQL to handle conditional logic.
The interviewer asked me to explain the concept of UNION in SQL and write queries using the SUM() function. I was also given questions on constraints, such as retrieving all records where names start with a specific letter (e.g., 'L').

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What is the purpose of the return keyword?