What challenges can arise when processing a large volume of data?, What are the main characteristics of big data?, How would you explain the difference between structured and unstructured data?, What factors might influence your choice between scaling up and scaling out?, How can data visualization help a team make better decisions?, What information would you include in a database schema?, Why might a table need both a primary key and a foreign key?, What could cause a database to contain NULL values?, When might a non-relational database be a better choice?, How would you decide whether two tables should be linked?, How would you find the total number of purchases made during a specific date range?, What is the difference between filtering rows before grouping and filtering grouped results?, When would you use an inner join instead of a left join?, What might cause a query to return unmatched rows?, How would you remove duplicate records while keeping one copy?, What is the purpose of an aggregate function? Can you give an example?, How can a window function help with data analysis?, What would you check if a query returned fewer rows than expected?, How would you explain a technical solution to a colleague who doesn’t work with databases?, Tell me about a time when you had to investigate unexpected results in a report., What would you do if two data sources showed different values for the same metric?, How do you decide which information to include in a dashboard?, How would you explain the advantages and disadvantages of a solution you proposed?, What would you say if you weren’t sure about the answer to a technical question?

Interview 1

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