SQL Fundamentals

What does SUM(salary) return when used in a query?

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Which condition correctly filters out NULL values?

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Which aggregate function calculates the arithmetic mean of a column?

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What is a primary key?

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What does MIN(price) return in a query?

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Which clause is used to group rows sharing a property so aggregate functions can be applied?

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What is the difference between WHERE and HAVING?

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Which SQL statement is used to add new rows to a table?

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Which statement modifies existing records in a table?

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What happens if you run DELETE FROM employees without a WHERE clause?

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Which type of JOIN returns only rows where there is a match in both tables?

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Which SQL statement is used to retrieve data from a database?

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